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SYRACUSE — Shut down for six innings by Daniel Rosenbaum, the Buffalo Bisons erupted for five runs in the eighth inning against the Syracuse bullpen for a 6-1 victory over the Chiefs before 3,714 in the opener of their four-game International League series at NBT Bank Stadium.

Eugenio Velez started the uprising with a leadoff homer against reliever Jeff Mandel. After two more hits, Patrick McCoy relieved Mandel and gave up an RBI double to Jim Negrych. Mauro Gomez’s second homer of the game finished the scoring. Negrych, who went into the game batting .611, went 1 for 4 to lower his league-leading average to .545.

Gomez homered in the second to give Buffalo a 1-0 lead but Chris Marerro tied it for the Chiefs with a homer to right in the fourth.

Claudio Vargas (1-0) pitched seven innings for the win. Bobby Korecky pitched two innings of shutout relief.

Rosenbaum, a 25-year-old left-hander who was drafted by Washington out of Xavier University in 2009, allowed the Herd just two hits and no walks in six innings. He struck out only one.

Right-hander Justin Germano (1-1, 10.13) will pitch for the Herd tonight (6 p.m., Radio 1520 AM) against Ross Ohlendorf (2-0, 1.64).

The Bisons’ starting rotation continued in a state of flux Monday when the Toronto Blue Jays obtained the contract of right-hander Ramon Ortiz. The veteran had made one start for the Herd allowing two runs in five innings with a no decision April 5 against the Rochester Red Wings.