Texas Rangers right-handed pitcher David Robertson has surpassed his former teammate Mariano Rivera in career strikeouts by a reliever

David Robertson reacts after giving up an RBI single to Boston Red Sox’s Danny Jansen during the eighth inning

David Robertson first saw Mariano Rivera up close when he joined the New York Yankees in 2008. The experience made a big impact on him. “I learned a lot from watching him,” Robertson said. “He’s…