SAN FRANCISCO — The Giants have selected the contract of left-hander Carson Whisenhunt, the top pitching prospect in their organization, ahead of his first career start on Monday night at Oracle Park against the Pittsburgh Pirates.

With a 5-3 loss on Sunday evening, the Giants were swept by the New York Mets. They dropped to 54-52 on the season, falling three games back of the final Wild Card spot. They’ve lost seven of their first nine games in the second half, and nine of their last 11 going back to the first half.