Historical clue formulations

• First person? — 2022-01-01
• Gold medalist — 2016-02-07
• Unreturned tennis shot — 2013-04-08
• Champion — 2012-06-12
• ... — 2004-01-15
• See 29-Across — 2003-03-05
• Person in a circle, maybe — 1994-05-29