It's the first ejection of the season for Melvin but second time he's been run by Wolcott in 10 months.
"I think both teams had some issues with it in that game," Melvin said. "That happened to me the first time I said something. Some other guys were saying something, I think on both sides, but maybe he thought I was a little more demonstrative than anybody else. He's thrown me out before for that.
Former A's reliever Luke Gregerson, now with the Astros, was on the mound for Oakland when Melvin was ejected by Wolcott last year.
"I absolutely knew it was the wrong call, and I lost my cool a little bit and was yelling at the guy," Gregerson said. "Before I could get two words out, Melvin was there and getting thrown out for me."
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.