OAKLAND, Calif. – Stephen Piscotty hit Oakland’s second walkoff grand slam of the year and the Athletics beat the Texas Rangers 5-1 Tuesday night for their fourth straight win.The late-game theatrics helped the A’s win on a night when prized pitching prospect Jesus Luzardo pitched five scoreless innings in his first career start for Oakland and Texas starter Lance Lynn allowed first run of the season.Edinson Volquez (0-1) got into trouble quickly in the ninth inning when he walked two batters and gave up a hit to load the bases with nobody out.Volquez retired Robbie Grossman on a popup before Piscotty hit a first-pitch drive over the wall in center to match the opening night 10th-inning slam by Matt Olson against the Angels.Liam Hendriks.