Pavin Smith hit his first career grand slam, leading the Arizona Diamondbacks to a 6-3 victory over the St. Louis Cardinals on Monday night.

While he was in the on-deck circle, Smith admitted the thought of hitting a grand slam entered his mind.

Ketel Marte also homered and drove in another run with a single for the Diamondbacks.

Merrill Kelly (1-2) pitched six innings, allowing five hits and a run. He struck out three and did not walk a batter. Kelly improved to 3-1 in five career starts against the Cardinals. Andrew Chafin earned his third save after facing three batters in the ninth.

Jack Flaherty (1-2) was lifted in the seventh after facing three batters. He gave up four hits. He walked three and struck out four.

Marte led off the seventh with his second homer of the season to give the lead back to Arizona after St. Louis had tied the game in the sixth.

Lourdes Gurriel Jr. doubled and Christian Walker drew a walk to chase Flaherty. Andre Pallante entered and promptly walked Corbin Carroll on four pitches to load the bases.

Smith ripped a 2-2 curveball 414 feet into the right field bleachers for his first homer of the season.

St. Louis got two runs back when Alec Burleson hit a two-out, two-run homer in the eighth off José Ruiz. Burleson has hit safely in 11 of his last 12 games since April 2.

Jordan Montgomery (2-0, 1.46) is making his first start and appearance against Arizona. The Diamondbacks are one of four teams he has yet to face along with San Francisco, San Diego and St. Louis.