By CHARLES ODUM Matt Diaz drove in the go-ahead run with an eighth-inning double and the Atlanta Braves beat Philadelphia 5-2 on Thursday night to complete their first home sweep of the Phillies in four years.Diaz had his second straight three-hit game to lift the Braves to their fourth consecutive win and drop the Phillies into a tie with Florida for first in the NL East.With the score tied at 2, Brian McCann led off the eighth with a single off Ryan Madson (2-4).