Wales' Rhys Williams again demonstrated his potential with a third personal best of the Commonwealth Games in finishing fourth in the 400m hurdles final on Thursday.

Williams produced a trademark late burst to clock 49.09 seconds in a race won by South African Louis Van Zyl in a new Games record of 48.05s.

Defending champion Chris Rawlinson's final race in the event - he will now retire - ended in disappointment as he trailed in last in 52.89.

Williams, the son of Welsh rugby legend JJ Williams, said: "I would have loved to have got a medal, fourth is the worst possible position to come.

"But before the start I wasn't sure if I was going to race because I had a bad hamstring.

"The crowd was great, I was desperate to get into the final just to run in front of this massive crowd because it does nothing but lift you.

"I've enjoyed the whole experience. I've finished fourth, got a personal best, but I'm definitely not contented.

"I want to go on to bigger and better stuff."

A disappointed Rawlinson revealed his last race had been run in agony due to a groin injury.

"I wanted it to be something to remember, like winning a medal, but straight away I was in a lot of pain warming up," the 33-year-old from Rotherham said.

"I was hopeful but as soon as I stepped out of the blocks the pain was too much.

"I was in agony but I was never going to scratch even if I ran 60 seconds.

"If I'm going to finish my career I'm going to finish in front of 80,000 people in this crowd.

"I didn't produce a performance worthy of this stadium, but I can take the memory away."