Buster Posey homers in the 17th inning to send the Giants to a 3 – 2 win over the Reds, in a game that takes 5 hours and 28 minutes. Posey’s shot off Robert Stephenson is the latest walk-off homer in San Francisco’s history, bettering a 16th-inning blast by Willie Mays in 1963. Umpire Tony Randazzo has to leave the game in the 13th, feeling the after-effects of having been hit in the face by a Johnny Cueto fastball back in the 5th.

On May 12, 2017 — Buster Posey homers in the 17th inning to send the Giants to a 3 – 2 win over the Reds, in a game that takes 5 hours and 28 minutes. Posey’s shot off Robert Stephenson is the latest walk-off homer in San Francisco’s history, bettering a 16th-inning blast by Willie Mays in 1963. Umpire Tony Randazzo has to leave the game in the 13th, feeling the after-effects of having been hit in the face by a Johnny Cueto fastball back in the 5th.

Source:
Baseball Reference May 12