Yadier Molina broke out of a slump with a home run and three singles as Shelby Miller and the St. Louis Cardinals remained tied for first place in the NL Central with a 12-2 win Sunday over the Seattle Mariners.
Matt Adams also homered as St. Louis won for the seventh time in nine games and kept pace with Pittsburgh.
Both teams are 87-62 with 13 games remaining.
Miller (14-9) gave up one earned run and three hits in five innings.
He became the first St. Louis rookie to reach 14 wins in a season since Dick Hughes won 16 in 1967.
Molina's second-inning homer off Erasmo Ramirez (5-2) snapped an 0-for-15 skid.
Molina scored three times and raised his batting average to .317.