Greene, who claimed the 400m hurdles world crown in 2011, beat fellow Welshman Rhys Williams
with a season’s best run of 48.66seconds in Birmingham.
The 27-year-old was at the Alexander Stadium in a bid to find form, having qualified for next month’s World championships by virtue of being the reigning champion.
And he was pleased with the execution of his performance that left Williams in second despite a personal best, though he too has qualified for Moscow.
“I haven’t been in top form so far and it was a really close race and exciting for the neutral so I was pleased to come away with victory,” he said.
“I felt I went out fairly aggressively. Probably the middle part of my race was a bit slow so I pushed on a bit and managed to pick up a bit of speed and finished it off well.
“I need to carry on doing what I am doing in training – my times are coming down – and I know I will be in the right shape for Moscow.”
Sainsbury’s British Championships is the second event in the Sainsbury’s Summer Series. For more information on Sainsbury’s support of world class athletics and disability sport go to www.sainsburys-live-well-for-less.co.uk/occasions/anniversary-games/
MORE: The latest football news
MORE: The latest tennis news