After Erlin struck out, Alvarez (2-2) walked Venable to load the bases. Denorfia followed with his two-run single up the middle to raise his career batting average with the bases loaded to .406 with 32 RBIs in as many at-bats.
Smith's ensuing RBI single extended his hitting streak to eight games (17-for-31, .548, with seven doubles, three triples and a home run). He drove in seven runs in the final three games against the Marlins.
Miami's four-run eighth opened with Yelich's leadoff, 430-foot homer to right-center off right-handed reliever Dale Thayer.
After Johnson singled off Thayer, right-hander Joaquin Benoit came on in relief and gave up a single to Stanton before getting McGehee to line out to right. Baker followed with a sinking line drive to right that eluded the diving attempt of Denorfia and rolled to the warning track for a two-run triple. Baker scored on shortstop Adeiny Hechavarria's groundout to second.
NOTES: The Marlins promoted RHP Henry Rodriguez from Triple-A New Orleans to replace RHP Carlos Marmol, who was designated for assignment after Saturday night's game ... OF/1B Xavier Nady opted to become a free agent rather than report to the Padres' Triple-A affiliate in El Paso. He cleared waivers Thursday after being designated for assignment. ... RHP Casey Kelly will continue his rehab from 2013 Tommy John surgery with Double-A San Antonio on Wednesday after making two starts for Class A Lake Elsinore ... Padres SS Everth Cabrera missed Sunday's game after wife gave birth to the couple's second child late Saturday night.