SAN FRANCISCO — It was a three-home run game that convinced the Giants Mac Williamson belonged in the major leagues again.
A five-strikeout game could be giving the organization second thoughts.
Three weeks after Williamson forced his way onto the Giants’ roster with three home runs for Triple-A Sacramento, the outfielder is in the midst of one the worst slumps of his life. After entering Thursday’s game against Atlanta with a .143 average, Williamson became the first Giants player in nearly six seasons to strike out five times in the same game.
“As a pitcher, when you’re looking up there and the guy is hitting .