NEW YORK — With a Triple-A pitcher called up for a spot start and a utilityman smacking an early two-run homer, the Boston Red Sox, having now won eight straight games, keep winning with an unlikely formula.Their latest victory was a 4-0 win over the New York Mets on Saturday, earned on the strength of Eduardo Rivera’s 3 2/3 scoreless innings, a key fourth-inning two-run homer from Andruw Monasterio and a late insurance shot from Masataka Yoshida. The win moved the Red Sox within a half-game of the third American League wild card spot.They have now won 13 of their last 15 games with one game to go before the All-Star break.“It feels good, obviously,” interim manager Chad Tracy said. “You felt the vibes at times and we were struggling — struggling to score — and didn’t feel like things were going right. And now we’re enjoying a stretch here. We’re doing a lot of things right. We’re throwing the ball great. We’re getting clutch hits, we’re scoring runs early. We’re stretching pitch counts on starters. We’re doing a fantastic job. So we just got to keep playing good baseball.”After their travel fiasco from Chicago ahead of the series opener, a slightly more refreshed Red Sox team wore newly made T-shirts Saturday before the game to commemorate their nightmarish journey. The white T-shirt pictured a plane on the front that read “Show and Go Airlines,” referencing their hustle from the airport to Citi Field on Friday with little time to prepare.