Historical clue formulations

• Who said "Baseball is 90% mental. The other half is physical" — 2023-04-03
• Player with a record 10 World Series championships — 2020-12-10
• Player with the most seasons (10) on a World Series-winning team — 2016-12-30
• Speaker of this puzzle's "double quote" — 2016-07-10
• Who said "Always go to other people's funerals, otherwise they won't go to yours" — 2015-06-22
• Source of all the quotes in this puzzle — 1999-01-10
• See 17-Across — 1996-12-18
• See 50-Across — 1996-04-19