The San Francisco Giants started the clock on the Major League career of one of their top pitching prospects, Carson Whisenhunt.

San Francisco Giants rookie Carson Whisenhunt shares an emotional response to fan support ahead of MLB debut vs. the Pirates at Oracle Park.

The Giants are planning to call up left-hander Carson Whisenhunt, the club’s No. 3 prospect per MLB Pipeline, to make his Major League debut in Monday night’s series opener against the Pirates at Oracle Park.

San Francisco Giants pitcher Carson Whisenhunt and his family experienced nerves for several different reasons before his MLB debut on Monday.

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.

The Giants are still making a grave mistake keeping Austin Barnes in AAA. They need to call him up as soon as possible.

The Red Sox also assigned catcher Ronaldo Hernández, who they signed to a minor league deal July 17, to Double-A Portland to make room for Tromp. He appeared in four games for Worcester.