Ross is trying to convince the Rangers that he can be a starting pitcher in the Majors, but did not advance his cause by allowing six runs in 1 2/3 innings. Ross was gone after throwing 58 pitches and the Rangers have now lost six straight. It's the fourth time this season that the Rangers have a losing streak of six or more games.
The 10 runs allowed by the Rangers pitchers were a little too much to overcome for an offense that has scored nine runs in the past six games.
"Robbie Ross feels bad right now," Rangers manager Ron Washington said. "It just wasn't his day. Robbie Ross was looking forward to this start but it didn't happen like he wanted it to. It took a lot out of him. The guy was ready to go. It just didn't happen."
Ross threw five no-hit innings in his last start against the Astros, but was not able to build on that. Instead he is now 2-6 with a 6.25 ERA in 12 starts and nine relief appearances.
"The frustrating part was having an outing like I had in Houston and then having this one," Ross said. "It didn't help. Obviously I wanted to [build] on the good game in Houston but it didn't happen."
Ross is getting this chance to start because Miles Mikolas is sidelined with shoulder fatigue and Yu Darvish is likely out for the season with mild inflammation in his right elbow. Mikolas received an injection Thursday and is expected to resume throwing in the next few days.
The Rangers have also been going with a temporary six-man rotation because Scott Baker has been dealing with some neck stiffness. But Baker is scheduled to pitch Friday and Ross may finish out the season in the bullpen unless some other unforeseen event intervenes.
All six runs off Ross came across after he retired the first two hitters in the second inning. Ross got Kyle Seager on a fly to right and Corey Hart on a grounder to third, but then the next seven batters reached base before Washington went to the bullpen.
"He just couldn't get out of the inning. He couldn't execute a pitch to get out of the inning. Three of the seven batters he had two strikes on and couldn't put them away. He lost his command."
The rally started at the bottom of the Mariners lineup. Ross put himself in trouble by walking Chris Denorfia and Chris Taylor. Jesus Sucre and Austin Jackson followed with consecutive run-scoring singles to give the Mariners a 2-0.
"There's a lot of different ways to win games," Mariners manager Lloyd McClendon said. "Getting on base with those two walks opened up a big inning."
A walk to Dustin Ackley loaded the bases and then two more singles by Robinson Cano and Kendrys Morales brought in three more runs.
"It was just tough. I got two quick outs on six pitches, then got behind Denorfia and just kept picking around and just started falling slowly into mistakes," Ross said. "I kept saying I was one pitch away and then we can go swing the bats and they'll get me some runs. I tried to do too much instead of getting quick outs."
Washington brought in Jon Edwards but Seager singled home one more run to make it 6-0 before Hart struck out to end the inning. The Mariners added three more runs in the third inning with the big blow being a two-out, two-run double by Cano.
Patton entered the game in the fourth and retired all six batters he faced. Bonilla allowed two hits over three innings, including a home run by Denorfia. His first pitch was the most memorable, bouncing in the dirt in front of home plate, then bouncing up and hitting umpire Vic Carapazza in the extreme lower midsection.
"Got him in the kneecap, right?" Washington said.