Jon Lester got 26 outs before allowing a run Monday afternoon, but it was that final out that eluded him.
Entering Monday, eight teams were within six games of the American League's final wild card spot.
The Cubs will be without two important players as they enter the stretch run toward the postseason.
The Toronto Blue Jays were winners at the trade deadline, but that won't guarantee them an American League East pennant.
Chase Utley – a six-time All-Star second baseman and a World Series champion with the Philadelphia Phillies – is the biggest name the Cubs have been linked to in a potential August trade.