The Philadelphia Phillies (57-52) got a strong first start from newcomer Jason Vargas, but blew a two-out, two-strike lead, ultimately losing a 4-3 game to the Chicago White Sox (47-60) in 15 innings at Citizens Bank Park.
With the loss, the Phillies will drop one game back of the Cubs and Nationals, who each won, in the National League Wildcard race heading into Saturday action.
The visitors jumped on top first when Cuban-born first baseman Jose Abreu blasted his team-leading 23rd home run of the season deep into the seats in center field.