The Baltimore Orioles complete the biggest comeback in their history, besting Boston, 11 – 10, after trailing 10 – 1. They score 5 runs in the 7th and 5 more in the 8th, capped by Nick Markakis’ two-run double off closer Jonathan Papelbon, thus depriving John Smoltz of a chance to win his first game for the Red Sox.

This Day In Baseball

On June 30, 2009 The Baltimore Orioles complete the biggest comeback in their history, besting Boston, 11 – 10, after trailing 10 – 1. They score 5 runs in the 7th and 5 more in the 8th, capped by Nick Markakis’ two-run double off closer Jonathan Papelbon, thus depriving John Smoltz of a chance to win his first game for the Red Sox.

Source
Baseball Reference June 30