Port Glasgow Athletic 1889-90:
1890/4/26 2nd Port Glasgow Athletic 1 - 0 2nd Morton
1890/4/12 Albion Rovers 5 - 1 Port Glasgow Athletic
1890/4/5 Morton 1 - 2 Port Glasgow Athletic
1890/3/29 Thistle 1 - 1 Port Glasgow Athletic
1890/3/22 Port Glasgow Athletic 8 - 6 Kilbirnie
1890/3/15 Abercorn 1 - 0 Port Glasgow Athletic RCup final
1890/3/8 2nd Port Glasgow Athletic 6 - 2 Ladyburn
1890/3/8 St Mirren 6 - 1 Port Glasgow Athletic
1890/2/22 Dykebar 0 - 4 Port Glasgow Athletic RCup SF replay
1890/2/15 Dykebar 2 - 2 Port Glasgow Athletic RCup SF replay
1890/2/1 Port Glasgow Athletic L - W Albion Rovers
1890/1/25 Port Glasgow Athletic 2 - 2 Dykebar RCup SF
1890/1/18 Partick Thistle Swifts 6 - 2 2nd Port Glasgow Athletic
1890/1/18 Port Glasgow Athletic 2 - 9 Partick Thistle
1890/1/11 Ladyburn 2 - 0 Port Glasgow Athletic 2nd XI
1890/1/11 Port Glasgow Athletic 3 - 6 Uddingston
1890/1/4 Port Glasgow Athletic 3 - 3 Arthurlie
1889/12/28 Port Glasgow Athletic 2 - 5 Dalry
1889/12/21 Port Glasgow Athletic 7 - 2 Methlan Park
1889/12/14 Northern 2 - 1 Port Glasgow Athletic
1889/12/7 bye RCup R3
1889/12/7 Port Glasgow Athletic 1 - 2 Pollokshaws
1889/11/30 Port Glasgow Athletic 5 - 4 Thistle (Glasgow)
1889/11/16 Port Glasgow Athletic 4 - 0 Cathcart RCup R2
1889/11/9 Port Glasgow Athletic 9 - 4 Renton
1889/10/26 Port Glasgow Athletic 6 - 1 Thornliebank
1889/10/26 Port Glasgow Athletic wo/scr Thornliebank RCup R1
1889/10/19 Port Glasgow Athletic 3 - 4 Kilbirnie ScCup R3
1889/10/12 Port Glasgow Athletic 3 - 3 Morton
1889/10/5 2nd Port Glasgow Athletic 3 - 6 Partick Thistle Swifts
1889/10/5 Partick Thistle 5 - 2? Port Glasgow Athletic
1889/9/28 Morton Strollers 4 - 0 2nd Port Glasgow Athletic
1889/9/28 Port Glasgow Athletic 8 - 0 Greenock Abstainers ScCup R2
1889/9/21 Port Glasgow Athletic 2 - 5 Dykebar
1889/9/14 St Mirren 3 - 1 Port Glasgow Athletic Sc2XICup R1
1889/9/14 Harp (Dundee) 4 - ? Port Glasgow Athletic
1889/9/7 Port Glasgow Athletic 2 - 1 Neilston ScCup R1
1889/8/31 2nd Port Glasgow Athletic 3 - 2 Carlton (Greenock)
1889/8/31 Uddingston 3 - 1 Port Glasgow Athletic
1889/8/24 Port Glasgow Athletic 6 - 1 Neilston
1889/8/10 Morton 3 - 1 Port Glasgow Athletic Morton Sports
1889/8/3 Port Glasgow Athletic 3 - 1 Abercorn Morton Sports
(Sources: The Beautiful Dribbling Game for the Scottish Cup; Scottish Football Historical Archive for the Renfrewshire Cup and Scottish Second Eleven Cup; Glasgow Herald for the rest.)
Port Glasgow Athletic 1888-89:
1889/6/8 Port Glasgow Athletic 4 - 4 Kilmarnock
1889/5/18 Morton 7 - 2 Port Glasgow Athletic ["sixth occasion"]
1889/5/11 Port Glasgow Athletic 1 - 4 Shettleston
1889/5/4 Port Glasgow Athletic 4 - 4 Glasgow Thistle
1889/4/27 Port Glasgow Athletic 5 - 4 Cowlairs
1889/4/20 Port Glasgow Athletic 4 - 4 Morton
1889/3/16 1st RRV 3 - 4 Port Glasgow Athletic
1889/3/16 Clydebank 10 - 1 Port Glasgow Athletic
1889/3/9 Port Glasgow Athletic 3 - 4 Dykebar
1889/3/2 Morton 1 - 4 Port Glasgow Athletic
1889/2/23 Victoria (Port Glasgow) 2 - 3 2nd Port Glasgow Athletic
1889/2/23 Port Glasgow Athletic 4 - 4 Renfrew
1889/2/23 Rangers 2 - 5 Port Glasgow Athletic
1889/1/19 St Mirren 6 - 1 Port Glasgow Athletic
1889/1/12 Ayr FC 8? - 2 Port Glasgow Athletic
1889/1/5 Port Glasgow Athletic 3 - 1 1st RRV
1888/12/29 Abercorn 6 - 1 Port Glasgow Athletic
1888/12/15 Albion Rovers 5 - 2 Port Glasgow Athletic
1888/12/1 Celtic Crusaders 5 - 3 2nd Port Glasgow Athletic
1888/12/1 Port Glasgow Athletic 2 - 5 Celtic
1888/11/24 Port Glasgow Athletic 0 - 6 Partick Thistle hard to make out
1888/11/17 Renfrew 4 - 1 Port Glasgow Athletic RCup R2
1888/11/10 Kilmarnock 3 - 3 Port Glasgow Athletic
1888/11/3 Dykebar Swifts 3 - 2 2nd Port Glasgow Athletic
1888/10/27 Port Glasgow Athletic 10 - 2 Greenock Rangers RCup R1
1888/10/20 Port Glasgow Athletic 5 - 3 Jamestown
1888/10/13 Port Glasgow Athletic 9 - 2 Woodvale
1888/10/6 Port Glasgow Athletic 2 - 5 Clydebank
1888/9/29 Port Glasgow Athletic 1 - 2 St Mirren Sc2XICup R2
1888/9/29 Dykebar 0 - 6 Port Glasgow Athletic
1888/9/22 Port Glasgow Athletic 3 - 3 Northern
1888/9/8 Port Glasgow Athletic 4 - 3 Neilston Sc2XICup R1
1888/9/8 1st RRV 5 - 3 Port Glasgow Athletic
1888/9/1 Port Glasgow Athletic 3 - 7 Morton ScCup R1
1888/8/25 Morton 7 - 1 Port Glasgow Athletic
1888/8/18 Port Glasgow Athletic 5 - 4 Carfin Shamrock
1888/8/11 Thistle 2 - 2 Port Glasgow Athletic
May 18th was reported to be the sixth meeting between Port Glasgow and Morton, but I've only found five of them.
I don't know what to make of all the activity on February 23rd.
(Sources: The Beautiful Dribbling Game for the Scottish Cup; Scottish Football Historical Archive for the Renfrewshire Cup and Scottish Second Eleven Cup; the Glasgow Herald for the rest.)
Port Glasgow Athletic 1887-88:
1888/5/26 Port Glasgow Athletic 3 - 2 Hibs
1888/5/19 Port Glasgow Athletic 5 - 2 Dumbarton
1888/5/5 Port Glasgow Athletic vs Dykebar [very smudgy]
1888/4/7 Port Glasgow Athletic 9 - 1 Battlefield
1888/4/x Port Glasgow Athletic scr/wo 1st RRV G&DChCup R1
1888/3/24 Albion Rovers 3 - 2 Port Glasgow Athletic
1888/3/3 1st RRV 5 - 7 Port Glasgow Athletic
1888/2/11 Abercorn 4 - 1 Port Glasgow Athletic RCup SF
1888/1/28 Port Glasgow Athletic 2 - 1 Queen's Park (scratch team)
1888/1/14 St Mirren Strollers 3 - 0 2nd Port Glasgow Athletic
1888/1/14 Port Glasgow Athletic 2 - 0 St Mirren
1888/1/7 2nd Port Glasgow Athletic 4 - 3 2nd Partick Thistle
1888/1/7 Partick Thistle vs Port Glasgow Athletic [very blurry]
1887/12/24 2nd Port Glasgow Athletic 3 - 1 Dumbarton Rangers
1887/12/24 Dumbarton 4 - 0 Port Glasgow Athletic
1887/12/17 Port Glasgow Athletic 3 - 2 Hearts
1887/12/10 Port Glasgow Athletic 2 - 0 Renfrew RCup R3
1887/12/3 Greenock Rangers 3 - 2 Port Glasgow Athletic
1887/11/26 2nd Port Glasgow Athletic 2 - 4 Rangers Swifts
1887/11/26 Rangers 6 - 0 Port Glasgow Athletic
1887/11/19 bye RCup R2
1887/11/19 Port Glasgow Athletic 3 - 3 2nd Athletic
1887/11/12 Port Glasgow Athletic 3 - 1 1st RRV
1887/11/5 2nd Port Glasgow Athletic 2 - 1 2nd Hibs
1887/11/5 Hibs 2 - 0 Port Glasgow Athletic
1887/10/29 Abercorn 5 - 2 Port Glasgow Athletic Sc2XICup R3 replay
1887/10/29 Port Glasgow Athletic 10 - 0 Paisley Athletic friendly
1887/10/29 Port Glasgow Athletic wo/scr Paisley Athletic RCup R1
1887/10/22 Port Glasgow Athletic 5 - 5 Abercorn Sc2XICup R3
1887/10/15 Ayr FC 4 - 0 Port Glasgow Athletic ScCup R3
1887/10/8 Port Glasgow Athletic 3 - 1 Partick Thistle
1887/10/1 Port Glasgow Athletic 5 - 3 Renfrew ScCup R2 replay
1887/10/1 bye 2nd XI Cup R2
1887/9/24 2nd Port Glasgow Athletic 13 - 1 2nd Greenock Rangers
1887/9/24 Renfrew 3 - 3 Port Glasgow Athletic ScCup R2
1887/9/17 Dumbarton Athletic 3 - 0 Port Glasgow Athletic
1887/9/10 Port Glasgow Athletic 6 - 0 Arthurlie Sc2XICup R1
1887/9/10 St Mirren 6 - 2 Port Glasgow Athletic
1887/8/27 Port Glasgow Athletic 11 - 0 Greenock Rangers ScCup R1
1887/8/13 Port Glasgow Athletic 5 - 3 Ayr FC
(Sources: The Beautiful Dribbling Game for the Scottish Cup; Scottish Football Historical Archive for the Renfrewshire Cup, Greenock and District Charity Cup and Scottish Second Eleven Cup; the Glasgow Herald for the rest.)
Port Glasgow Athletic 1886-87:
1887/5/21 Port Glasgow Athletic 3 - 5 Hibs
1887/5/14 Port Glasgow Athletic 2 - 4 Thornliebank
1887/5/7 Port Glasgow Athletic 4 - 2 Partick Thistle
1887/4/30 East Stirlingshire 3 - 2 Port Glasgow Athletic
1887/4/23 2nd Port Glasgow Athletic 3 - 4 2nd Vale of Leven
1887/4/23 Vale of Leven 7 - 0 Port Glasgow Athletic
1887/4/16 Port Glasgow Athletic 2 - 1 Cambuslang
1887/4/9 Port Glasgow Athletic 4 - 3 Airdrieonians
1887/4/2 Cambuslang 1 - 0 Port Glasgow Athletic
1887/3/26 Port Glasgow Athletic 1 - 0 Partick Thistle
1887/3/19 Dumbarton 1 - 1 Port Glasgow Athletic
1887/3/12 St Mirren 1 - 0 Port Glasgow Athletic
1887/3/5 2nd Renfrew 1 - 3 2nd Port Glasgow Athletic
1887/3/5 Port Glasgow Athletic 6 - 1 Renfrew
1887/2/26 Port Glasgow Athletic 5 - 1 Rangers (Greenock)
1887/2/19 Port Glasgow Athletic 3 - 2 St Mirren
1887/2/12 2nd Vale of Leven 5 - 2 2nd Port Glasgow Athletic
1887/2/12 Port Glasgow Athletic 1 - 5 Vale of Leven
1887/2/5 Kilmarnock 3 - 1 Port Glasgow Athletic
1887/1/22 2nd Port Glasgow 6 - 1 2nd Clyde
1887/1/22 Arthurlie 1 - 0 Port Glasgow Athletic RCup R4
1887/1/1 Port Glasgow Athletic 2 - 5 Our Boys (Dundee)
1886/12/25 Port Glasgow Athletic 1 - 3 Vale of Leven ScCup R6
1886/12/11 2nd Port Glasgow Athletic 4 - 1 Lyle Athletic
1886/12/11 Paisley Athletic 1 - 8 Port Glasgow Athletic RCup R3
1886/12/4 Belgrove 4 - 1 Broadfield (Port Glasgow) Played at Greenock.
1886/12/4 Port Glasgow Athletic 6 - 2 St Bernard's ScCup R5
1886/11/27 Dumbarton Athletic 3 - 0 Port Glasgow Athletic
1886/11/20 Port Glasgow Athletic 8 - 0 Cartvale friendly
1886/11/20 Port Glasgow Athletic wo/scr Cartvale RCup R2
1886/11/13 Port Glasgow Athletic 2 - 3 Morton Sc2XICup R1
1886/11/13 Morton 4 - 4 Port Glasgow Athletic (protested)
1886/11/13 bye SCup R4
1886/11/6 Port Glasgow Athletic 3 - 2 East Stirlingshire
1886/10/30 Port Glasgow Thistle 6 - 0 Broadfield (at Clune Park) Greenock and District Junior Cup
1886/10/30 Hibs 2 - 0 Port Glasgow Athletic
1886/10/30 bye RCup R1
1886/10/23 Abercorn 1 - 5 Port Glasgow Athletic ScCup R3
1886/10/16 2nd Port Glasgow Athletic 3 - 3 2nd Northern
1886/10/9 Port Glasgow Athletic 7 - 4 Kilmarnock
1886/10/2 St Mirren 2 - 3 Port Glasgow Athletic ScCup R2
1886/9/25 Port Glasgow Athletic 8 - 3 Morton
1886/9/11 Port Glasgow Athletic 10 - 1 Johnstone Harp ScCup R1
1886/9/4 Port Glasgow Athletic 4 - 2 Dumbarton Athletic
1886/8/28 2nd Port Glasgow Athletic 3 - 3 2nd Hearts
1886/8/28 Hearts 2 - 2 Port Glasgow Athletic
1886/8/21 2nd Port Glasgow Athletic 3 - 0 Ayr Strollers
1886/8/18 Port Glasgow Athletic 3 - 6 Dumbarton
1886/8/14 Morton 2 - 0 Port Glasgow* Morton FC amateur athletic sports
1886/7/24 St Mirren 3 - 2 Port Glasgow Athletic St Mirren FC athletic sports
*30 minutes each way.
(Sources: The Beautiful Dribbling Game for the Scottish Cup; Scottish Football Historical Archive for the Renfrewshire Cup and Scottish Second Eleven Cup; Wikipedia "1886-87 Dumbarton F.C. season for 1886/8/18; Glasgow Herald for the rest.)
Port Glasgow Athletic 1885-86
1886/5/29 Port Glasgow Athletic 5 - 4 Dennistoun Athletic
1886/5/22 Port Glasgow Athletic 3 - 1 Kilmarnock
1886/5/15 Port Glasgow Athletic 3 - 0 Cambuslang
1886/5/8 Strathmore (Dundee) 3 - 3 Port Glasgow Athletic
1886/5/1 Port Glasgow Athletic 8 - 2 Ayr FC
1886/4/24 2nd Port Glasgow Athletic 11 - 1 2nd Cambuslang
1886/4/24 Cambuslang 1 - 0 Port Glasgow Athletic
1886/4/17 Port Glasgow Athletic 8 - 0 Abercorn
1886/4/10 Port Glasgow Athletic 4 - 2 Thornliebank
1886/4/3 2nd Port Glasgow Athletic 2 - 2 2nd Abercorn
1886/3/27 Rangers 5 - 0 Port Glasgow Athletic Sc2XICup SF
1886/3/27 Port Glasgow Athletic 4 - 5 Partick Thistle
1886/3/20 Abercorn 4 - 0 Port Glasgow Athletic RCup final
1886/3/13 Port Glasgow Athletic 1 - 1 Arthurlie
1886/3/6 Port Glasgow Athletic 4 - 3 Annbank Sc2XICup R4
1886/2/27 Port Glasgow Athletic 7 - 0 Neilston RCup SF
1886/2/20 Northern 1 - 0 Port Glasgow Athletic
1886/2/13 Port Glasgow Athletic 6 - 2 St Mirren
1886/2/6 Port Glasgow Athletic 5 - 2 Hibs Sc2XICup R3
1886/1/30 Port Glasgow Athletic 4 - 1 St Mirren
1886/1/23 Port Glasgow Athletic 4 - 2 St Mirren (protested) RCup R3
1886/1/16 Port Glasgow Athletic 2 - 3 Rangers
1885/12/26 Third Lanark 4 - 1 Port Glasgow Athletic ScCup R5 replay
1885/12/19 Port Glasgow Athletic 1 - 1 Third Lanark ScCup R5
1885/12/12 Port Glasgow Athletic 7 - 0 Neilston Sc2XICup R2
1885/11/21 Port Glasgow Athletic 13 - 1 Waterloo RCup R2
1885/11/14 St Mirren 5 - 0 Port Glasgow Athletic
1885/11/14 bye SCup R4
1885/10/31 Port Glasgow Athletic 4 - 2 Cartvale ScCup R3
1885/10/? Lanemark L - W Port Glasgow Athletic Sc2XICup R1
1885/10/10 Neilston 0 - 2 Port Glasgow Athletic ScCup R2 replay
1885/10/3 Port Glasgow Athletic 1 - 1 Neilston ScCup R2
1885/9/26 Port Glasgow Athletic 4 - 0 Woodvale (Thornliebank)
1885/9/19 2nd Port Glasgow Athletic 2 - 5 2nd Airdrieonians
1885/9/19 Airdrieonians 5 - 2 Port Glasgow Athletic
1885/9/12 Port Glasgow Athletic 4 - 1 1st Renfrewshire RV SCup R1
1885/9/5 Port Glasgow Athletic 4 - 3 Arthurlie score uncertain
1885/8/29 Abercorn vs Port Glasgow Athletic
1885/8/22 Port Glasgow Athletic 5 - 1 Wishaw Swifts
Port Glasgow Athletic received more of the Glasgow Herald's attention than did Morton this season.
It isn't till 1886 that the Herald begins to sort football scores into Scottish, English and rugby categories.
(Sources: The Beautiful Dribbling Game for the Scottish Cup; Scottish Football Historical Archive for the Renfrewshire Cup and Scottish Second Eleven Cup; Glasgow Herald for friendlies. Several Monday Heralds are missing.)