 |
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| Friday, October 5th , 1888 |
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| SS Phil Croteau retired from professional baseball. |
| Thursday, July 12th , 1888 |
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| Signed free agent SP Tom Eubanks to a 1-year contract worth a total of $414. |
| Wednesday, May 23rd , 1888 |
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| Signed free agent SP Dave Long to a 1-year contract worth a total of $380. |
| Monday, April 30th , 1888 |
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| Signed free agent 2B Tom DeSautel to a minor league contract. |
| Sunday, April 8th , 1888 |
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| Signed free agent C Phil Hill to a 1-year contract worth a total of $314. |
| Tuesday, April 3rd , 1888 |
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| Signed free agent RF Joe Worthy to a 1-year contract worth a total of $314. |
| Friday, March 30th , 1888 |
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| Signed free agent SS Bill Provost to a 1-year contract worth a total of $350. |
| Tuesday, March 27th , 1888 |
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| Signed Scouting Director Mike Blakeney to a 2-year, $26 per year contract. |
| Thursday, March 22nd , 1888 |
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| Signed free agent 3B Dan Buckner to a 1-year contract worth a total of $254. |
| Tuesday, March 20th , 1888 |
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| Signed free agent SP Bill Hicks to a 1-year contract worth a total of $274. |
| Wednesday, March 14th , 1888 |
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| Signed free agent SS Bob Sullivan to a minor league contract. |
