ARLINGTON, Texas (AP) — Madison Bumgarner was upset with himself for allowing six runs the first two innings.

Then the big San Francisco left-hander was really ticked off by something the Texas Rangers did a couple of innings later.

Bumgarner gave up a pair of early two-run homers, then helped ignite a benches-clearing fracas when he shouted something toward the Rangers bench at the end of the fourth in the Giants’ 6-3 loss Friday night. It was their first visit since clinching the 2010 World Series in Texas.

“I think it was pretty self-explanatory, don’t you?” Bumgarner said afterward, without elaborating on what happened.

“(Bumgarner) was a little grumpy anyway because of the heat and the way the game was going,” manager Bruce Bochy said. “That was his boiling point. He settled down, and that’s over. Those things happen.”

Earlier in the fourth, Rougned Odor had a bunt single before a hard slide into fellow second baseman Joe Panik to break up a potential double play.

Bumgarner (11-6) looked directly at the Rangers bench and shouted something as he left the mound.

“In the beginning, it was Odor, for the bunt. Then Delino’s was, you know, (Bumgarner) kind of got a little excited when he made that pitch,” Rangers shortstop Elvis Andrus said. “I don’t get it. He likes to intimidate. I don’t know if he intimidates doing that.”

There were no ejections, punches thrown or contact made between players, who were kept separated by the umpires.

Andrus hit a two-run homer in the second to put Texas up 6-2. He doubled in the first, scoring then on Adrian Beltre’s homer lined over the 14-foot wall in left field.

Brandon Crawford’s solo homer in the ninth was his 16th for the Giants, who lost for only the third time their last 16 games.

Nick Martinez (6-6) won for the first time since June 9 — seven starts — allowing two runs with four strikeouts in 6 1-3 innings.

Texas has won three in a row since a 21-5 loss Tuesday night against the New York Yankees after leading 5-0 in the first inning.

In the top of the fifth, Panik made a hard slide into second, but Odor was able to sidestep and complete the inning-ending double play without incident.

Bumgarner matched a season high by allowing six runs, but all of those came in the first two innings. He struck out eight over seven innings.

“I’m glad Madison didn’t throw like that in that ballgame,” Bochy said, referring to the Game 4 of the 2010 World Series, the only other time Bumgarner has pitched at Texas.

He threw eight scoreless innings that Halloween night, allowing only three hits in a 4-0 win. The next night, the Giants clinched their first of three titles over the past five seasons.

Bumgarner said the 95-degree temperature at first pitch Friday wasn’t an issue, and that he felt he threw decent pitches on the balls hit out of the park.

“Just getting some outs, really. I found a way to get them out,” he said, explaining the difference after the first two innings. “They went in with a different game plan. I was able to adjust as the game went on for us.”

Only moments after newly acquired Cole Hamels appeared in the Rangers dugout wearing his No. 35 uniform for the first time, shaking hands with new teammates, both benches and bullpens were clearing.

“Yeah, that’s some serious excitement,” said Hamels, whose Rangers debut Saturday night comes a day after an eight-player trade completed to bring him from Philadelphia. “Just to be welcomed with them and then to join them.”

THE OTHER LEFTY

Reliever Jake Diekman, the other pitcher Texas got in the trade with the Phillies, retired all five batters he faced in the series opener.

TRAINER’S ROOM

Giants: RHP Tim Hudson was put on the 15-day disabled list with a shoulder strain. ... C Andrew Susac (sprained right thumb) is eligible to come off the DL Monday. He resumed throwing Friday.

UP NEXT

Giants: Chris Heston (11-5), who has won his last three starts, moves up a day to pitch in place of scheduled starter Hudson.

Rangers: Hamels makes his Texas debut, a day after the completion of the deal to get the ace lefty. He is 6-4 with a 4.21 ERA in 15 career starts for the Phillies against the Giants. He faced them July 10 in San Francisco, allowing nine runs and 12 hits in 3 1-3 innings.