The New York Mets mounted another late-inning comeback Sunday afternoon as Starling Marte hit a two-run eighth-inning homer to lift the hosts to a 5-4 win over the Cleveland Guardians in the first game of a doubleheader.The Mets, who squandered a 3-0 lead in the top of the eighth, have won four straight, including three in their last at-bat. New York won 10-inning affairs on walk-off hits by Pete Alonso on Wednesday and Francisco Lindor on Friday.The Guardians have lost four of five.The Mets took their lead on a fourth-inning RBI single by Eduardo Escobar, a sixth-inning sacrifice fly by Gary Sanchez and a seventh-inning homer by Brandon Nimmo. The Guardians stormed back in the top of the eighth, when Myles Straw (groundout) and Amed Rosario (single) had RBIs before Jose Ramirez hit a two-run homer.But Brett Baty drew a leadoff walk against Trevor Stephan (2-2) before Marte homered to right for his first round-tripper since April 7.David Robertson (2-0) gave up Ramirez’s homer but threw the last 1 1/3 innings to get the win.The Mets left the bases loaded in the second, when Brandon Nimmo grounded out to first for the final out, before they went ahead by mounting a two-out rally in the fourth against the Guardians’ Tanner Bibee. Daniel Vogelbach walked and Sanchez singled before Escobar singled to right to score Vogelbach.