England's Jason Roy

England's Jason Roy tries to hit for a six but is caught by Pakistan's Babar Azam during the Royal London One Day International at the Ageas Bowl in Southampton, England, Wednesday August 24, 2016. Photo: AP

SOUTHAMPTON: Jason Roy overcame a bout of dizziness to inspire England to a 44-run win over Pakistan using the Duckworth-Lewis method in a rain-affected one-day international on Wednesday, putting the hosts 1-0 ahead in the five-match series.

Chasing 261 to win in Southampton, England was 194-3 after 34.3 overs and well ahead of Pakistan on run rate when rain forced an end to play. Roy scored a 56-ball 65 to get England off to a flying start, while Joe Root hit 61 in England's latest impressive display in the 50-over format.

Roy called for medical attention after feeling light-headed, having run between the wickets after smashing 20 runs from 14 balls. Play was halted for five minutes.

"I had a headache, felt a bit dizzy," Roy said. "They got the physio and the doctor on, they told me to get some sugar on board ... I was able to get my bearings, settle and re-set myself and just go again."

England's Jason Roy

England's Jason Roy tries to hit for a six but is caught by Pakistan's Babar Azam during the Royal London One Day International at the Ageas Bowl in Southampton, England, Wednesday August 24, 2016. Photo: AP

England has now beaten Pakistan in nine of their last 10 meeting in the 50-over format, and ended a run of five straight ODI losses in Southampton.

"I thought we were outstanding with the ball," Roy said, "and it was a great way to start the series."

The second match is at Lord's on Saturday.

The ODI series follows an exciting test series that was drawn 2-2.