The Arizona Diamondbacks' series opener against the San Francisco Giants at Chase Field on Monday night grabbed headlines after a controversial play involving a fan.In the bottom of the eighth inning at Chase Field, Giants infielder Christian Koss launched a fly ball off Diamondbacks reliever John Curtiss toward the center field wall. While Diamondbacks outfielder Tim Tawa jumped to grab the ball, a fan wearing a Diamondbacks jersey grabbed it before him.The umpires ruled fan interference on the play initially, however, after Giants manager Bob Melvin challenged the call, it was ruled to be a double. The fan was ejected from the stands as the Giants felt robbed of a solo home run that would have tied the game.It proved to be a pivotal moment in the game as the Diamondbacks' 3-2 lead remained intact after the call. The home team added another run without reply in the bottom of the eighth to secure a 4-2 win.Giants manager laments offensive struggles in Diamondbacks loss. While the fan interference seemingly robbed the Giants of a run, manager Bob Melvin felt they had a chance to score a run with Koss in a scoring position. However, neither Rafael Devers nor Heliot Ramos managed to drive him home for the game-tying run.“We still have a chance to score a run there, and Elly gets the bat taken out of his hands like that for the second time in the game,” Melvin said. “Literally, (the catcher) is set up underneath (Ramos’s) armpit, and the ball is off the plate outside. That’s a tough one. But look, we’re in this position because we’re not doing much offensively. So it gets frustrating.”The Giants offense failed to come around as the NL West team lost for a 12th time in the last 17 games, concluding a disastrous June. The Giants are 45-40 for the season, falling eight games behind the Los Angeles Dodgers.