In his fourth at-bat Tomas did just that as he crushed a high fastball from Ken Giles the opposite way for a home run over the wall in right.
"I'm really happy," said Tomas, who was signed to a six-year $68.5 million contract after defecting from Cuba. "I'm always trying to hit the ball well and have good at-bats. I never focus on or try to hit a home run."
Tomas has, however, made some adjustments at the plate. One of those is where he positions himself in the batter's box.
The results have been noticeable. Even though he had not homered before Saturday, he had been driving the ball with more authority.
"It was great," D-backs manager Chip Hale said of the homer. "Great swing, he really went after it. This ballpark to right and to left is short, he knows that, and he was able to use that part of the park. It was a very good swing."
Tomas' teammates gave him the silent treatment when he first got back to the dugout before showering him with high-fives.
"It was the same thing that they did in Spring Training and in Triple-A too," Tomas said with a smile. "Nothing surprised me."
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, follow him on Twitter @SteveGilbertMLB and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.