By Neil McLeman Brooks Koepka has claimed his runner-up finish at last year’s Masters only proved to “everybody else” that he was back to his best. The injury-hit LIV Golf star led by four shots at the end of Saturday’s play before finishing two shots behind champion Jon Rahm. The American then won the US PGA the following month to take his Major tally to five – only one behind Sir Nick Faldo. Speaking before LIV Miami, Koepka was asked if his tied second finish at Augusta had proved to him he could still compete at the top level. “I already knew that,” he said. “I think it was more, I kept te…