Andy Murray says he still believes he can beat the top players as he impressed in San Diego.
Murray was due to play former US Open finalist Kei Nishikori in the opening round, but the Japanese ace pulled out just before the match.
Lucky Loser Denis Kudla stepped in instead as Murray's opponent, but the British star steamrollered him 6-3, 6-2.
He will now face world number nine Casper Ruud in the second round, but Murray says he is not remotely worried about whether or not he can still compete at that level.
Asked after the match if he was happy with how he was progressing, Andy Murray said: “It’s been better.
“The US Open was sort of the start of where I played a bit better and I just need to start beating some higher-ranked players.
“I've had opportunities in those matches against the top players I´ve played.
"I think I can beat them. I just need to start converting some of my opportunities against them.”
Murray faced world number three Stefanos Tsitsipas in the opening round of the US Open earlier this month and played his part in a brilliant match before losing the deciding set.
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