Tucson leads Las Vegas 6-0 after three innings Thursday at Parkview Field.
Jeremy Hefner has given up one hit and has two strikeouts for Tucson.
The Padres scored in the first inning and added five more in the fourth inning. Matt Clark, who spent the first half with the TinCaps in 2009, hit a two-run homer to highlight the fourth. Clark had 11 home runs with the TinCaps.