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7/9/2013 11:35 P.M. ET

Johnson doesn't mind remaining in eighth spot

MIAMI -- Chris Johnson understands he is one of the few players who have compiled a team-high batting average while also collecting a team-high plate appearances in the eighth spot of the lineup more than halfway through a season. But the Braves third baseman is not complaining.

"I don't mind at all, not one bit," Johnson said. "I would never tell the skipper what to do or to be asked to be moved up because the numbers say I deserve to be hitting higher. We've got a lot of good ballplayers on our team, and we're in first place. If we were in last place, maybe you could start shuffling things around."

As Johnson prepared to make his 25th start of the season in the eighth spot of Atlanta's lineup on Tuesday night, he was hitting .332 with a .374 on-base percentage and a .482 slugging percentage. His batting average ranked fourth among all National Leaguers with at least 250 plate appearances.

This kind of production usually earns a player a chance to move up to the middle of the lineup. But Braves manager Fredi Gonzalez sees some value in having Johnson in this spot where he can consistently aid in the attempt to turn the lineup over and increase the number of sacrifice opportunities pitchers get in the ninth spot.

"I think the eight-hole comes up big a lot during the course of a game, whether it's when there are people on base or when you make the other manager decide whether to face that guy or walk him," Gonzalez said. "When you've got Chris Johnson sitting in that hole, it makes it a little more difficult."

Looking purely at the numbers, it would seemingly make sense for Gonzalez to fill the eighth spot of his lineup with B.J. Upton, who entered Tuesday ranked last in the Majors with a .173 batting average -- 30 points lower than any other qualified player -- and sixth to last with a .266 on-base percentage.

Upton batted eighth in 16 of the 17 games he started from May 17-June 10. But after he showed some signs of encouragement early last month, Gonzalez moved Upton up a couple of spots in attempt to create more stolen base opportunities for the athletic outfielder.

It appeared Gonzalez's theory would prove beneficial when Upton recorded three of his seven stolen bases during a six-game stretch from June 14-18. But there have been few opportunities to run, as Upton has hit .191 with a .286 on-base percentage in the 15 games that have followed.

Martinez has season-ending shoulder surgery

MIAMI -- When Cristhian Martinez revealed last week that he was still experiencing some right shoulder discomfort, the Braves gained a sense the right-handed reliever would not pitch again this year. Their belief was verified on Tuesday when Martinez underwent a season-ending surgical procedure performed by Dr. James Andrews.

Andrews cleaned damage around Martinez's labrum and rotator cuff. The Braves announced the recovery time is expected to be seven to eight months.

Martinez revealed last week that he began experiencing more shoulder discomfort during his Minor League rehab assignment. He made just two appearances for Atlanta this year before being placed on the disabled list in early April with what was termed a right shoulder strain.

Martinez compiled a 3.86 ERA in the 120 appearances he has made since joining the Braves' organization in 2010. The 31-year-old right-hander has primarily served as a long reliever.

Mark Bowman is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.