If Mets fans weren’t well acquainted with Rafael Ortega before, they might be after Sunday night. The reserve outfielder who was called up from Triple-A Syracuse after the trade deadline went 3-for-4 with two runs scored and two RBI in the Mets’ 7-6 win over the Atlanta Braves on Sunday night at Citi Field. The Mets went down 3-0 in the first inning but scored six runs in a wacky fifth inning to come back and prevent a four-game sweep by Atlanta (75-42).