Jake Roth/US PresswireJuan RiveraDodgers at Diamondbacks, 5:10 p.m.Dee Gordon, SSCasey Blake, 3BAndre Ethier, RFMatt Kemp, CFJuan Rivera, 1BAaron Miles, 2BRod Barajas, CTony Gwynn Jr.Nathan Eovaldi, PHere's a tip of the hat to Juan Rivera, who has performed above my expectations (but not above those of the guy who hounded me on Twitter last month saying he was a great pickup). Rivera has a .359 on-base percentage and .416 slugging percentage in 64 plate appearances since coming to Los Angeles, which is superb by 2011 Dodger standards. He has effectively become an everyday player with starts in 17 of 20 games, counting tonight, when he makes his eighth start at first base.The Dodgers begin play tonight 9 1/2 games behind San Francisco and Atlanta, their narrowest deficit since June 27.