Andy Murray was unable to continue his fine run at the Western & Southern Open on Tuesday.
Murray, a former two-time champion of the event, was stopped by Milos Raonic who sealed his first win over the Briton in six years.
Murray headed into his last-16 date with Raonic having stepped up his return to competitive tennis with impressive wins against Frances Tiafoe and world No 7 Alexander Zverev.
But the Scot, who has battled injury problems, including two major hip surgeries, was left frustrated and unable to reach the same heights against Raonic in a 6-2 6-2 defeat.
“It was poor,” admitted Murray during his press conference.
“I didn’t play well, yeah, it was not a good day. The positives are that I got three matches in. Physically, I pulled up OK. Today, I don’t know if it was because I was fatigued or not. I didn’t feel particularly tired but I was certainly hitting some pretty bad tennis shots.
“I’m not happy with that level of performance, to be honest, so clearly a lot of work to do on my game before the US Open starts,” Murray told Sky Sports.
A scrappy fifth game by Murray handed Raonic the first break of serve in the match. The big-serving Canadian, who had already dumped out British No 1 Dan Evans a day earlier, appeared eager to make the Scot his next victim at the tournament.