Jason Kubel is making a strong case for inclusion in the NL MVP conversation.

Kubel had four home runs in the final two games of the Diamondbacks' three-game weekend sweep of Houston and, thanks to seven RBIs in those games, moved into the NL lead with 71 RBIs. Kubel had three homers and six RBIs in a 12-3 victory over Houston on Saturday, and admitted he was swinging to become the 15th player in modern major league history to hit four in a game when he struck out in the eighth inning.

"Absolutely was," Kubel said with a smile. "I got caught trying to hit it as hard as he was throwing it."

Kubel, who missed four starts with a tight right hamstring, followed with a bases-empty home run in the second inning of an 8-2 victory over the Astros on Sunday. Kubel also singled in a seven-run sixth inning and tripled in the seventh.

Kubel homered to left field, left-center and right field Saturday, using an all-fields approach that is one of the reasons he felt Chase Field would be a better fit than Minnesota's Target Field when he looked for matches on the free-agent market this winter. The D-backs got him at a very reasonable $15 million for two years.

"I'm happy with driving the ball all over the field, which is what I try to do but haven't always been able to do it. It's something I work on every day, and it's paying off," said Kubel, who has 21 homers, six in his last five games.

Only Detroit's Miguel Cabrera (79) and Texas' Josh Hamilton (78) have more RBIs than Kubel, who has 20-homer seasons in four of his last five, falling short only in an injury-plagued 2011 with the Twins. The production is not a surprise.

"Not at all. I'm hoping to do more. There is a good amount of baseball left. As long as guys keep getting on base for me, hopefully I can keep going," Kubel said.

"I definitely like the park a lot. The team. It's great chemistry here. I clearly liked what they did last year, and I think we have that in us this year and beyond. There are a lot of reasons why I came over

here. We have a great team. We have a great chance, and I think we are going to keep it going."