SAN FRANCISCO — There isn’t much that manager Bob Melvin hasn’t seen on a baseball field. Friday night provided him — and most of his players — with a first.

In the top of the fourth inning, Sean Murphy hit a bases loaded line drive at right fielder Mike Yastrzemski. Yastrzemski made the catch and fired home; Olson tagged up and burst for the plate. As Yastrzemski’s throw arrived and Olson slid home safe, a second ball entered the playing field.

From the angle of the throw, the ball appeared to be thrown by a fan from the upper deck. The throw did not interfere with the play, but the umpiring crew convened regardless. The play stood, giving Atlanta its first run of the game.

“That’s a first,” Melvin said after the Giants’ 5-4 win over the Braves. “I’ve never seen that before. I don’t kn

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