Carson Whisenhunt overcame a rocky start as he allowed four runs over five innings in his major-league debut, but the Giants’ losing streak hit four games as they fell to the Pittsburgh Pirates 6-5 on Monday night at Oracle Park. With Thursday’s trade deadline looming, San Francisco has lost 10 of its last 12 games.

Whisenhunt showed something in his major-league debut Monday night but there was nothing festive about a 10th loss in 12 games.

Starting pitching is a target area for the Giants as the deadline approaches, but getting some quality results from Whisenhunt at the beginning of his MLB career would be an enormous help for the club.