Arizona Diamondbacks' 6-3 win over the Padres on Monday.
For the second year in a row, someone hit an inside-the-park homer on opening day - former Diamondbacks player Emilio Bonifacio did it for the Florida Marlins last year, which was the first one after 41 years.
Mark Reynolds hit a two-run homer, the only earned runs among the six given up by San Diego starter Jon Garland (0-1).
Haren (1-0) allowed one run and struck out four without a walk. He threw 20 of 24 first-pitch strikes and had a three-ball count against only one batter.
Adrian Gonzalez and Kyle Blanks hit consecutive two-out homers off Bob Howry in the ninth for San Diego.