''I kept everybody off balance with the slider,'' Santana said. ''That was one of the keys.''
Gattis led off the seventh with his first homer since June 18, before he went on the disabled list for nearly three weeks with a bulging disk in his back. He also drove in Atlanta's other run with a two-out single off Dale Thayer in the eighth.
''He's a great hitter,'' teammate Andrelton Simmons said of Gattis. ''He's going to get back to doing what he was doing at the beginning of the year.''
Called up from Triple-A to fill in for ailing Ian Kennedy, Lane (0-1) shut down the Braves through six innings. But when the 37-year-old left-hander hung an 0-1 slider, Gattis drove it into the left-field seats for his 17th homer of the season.
''It's a little frustrating to make a mistake like that,'' said Lane, who was making his first big league start as a pitcher. ''There's not a lot of room for error. And it cost me.''
Lane was a journeyman outfielder with Houston and the Padres from 2002-07. He became a full-time pitcher before the 2012 season, looking to get back to the big leagues in a different position. He threw 4-1/3 scoreless innings for San Diego in two June relief appearances, and extended his scoreless streak to 10-1/3 innings before Gattis' long ball.
''The Padres gave me this opportunity,'' Lane said. ''Beyond that, I'm not sure what the situation will be. But I'm ready to go.''