PHOENIX >> Halfway through the four-year, $48 million contract he signed with the Dodgers in December 2014, Brandon McCarthy had been able to do little to justify that expense.But the Dodgers are starting to get a return on that investment.McCarthy continued a strong start to the season by completing seven innings for the first time since undergoing Tommy John surgery in 2015 as the Dodgers beat the Arizona Diamondbacks, 6-2, Sunday afternoon.