Jason Roy, England's Man of the Match in the first ODI against Pakistan, said that his bout of dizziness while batting was down to a low blood-sugar level. Roy scored a rapid 65 as England eased to a Duckworth-Lewis-Stern victory at the Ageas Bowl but required the assistance of the physio after feeling unwell in the fourth over of the chase.

Roy complained of a headache after running two with his opening partner, Alex Hales. He said it was not something he had experienced before but put it down to a hot day in the field and he was able to bat on for another 15 overs after taking on fluids.

"Not really, I'm not a doctor but it was a case of not having enough sugar on me, apparently," he said when asked to explain what had happened. "I got a headache, felt a bit dizzy, got the doctor and physio on. Stayed calm, got my fluids on, got my sugar on, got away.

"I'll just remember in future on a hot day to be mindful of that. I was able to get my bearings, settle and reset myself and just go again."

Roy's reluctance to come off was understandable given his rich run of form in ODIs this summer, with his average up at 95.25 from six innings. His aggression at the top of the order quickly helped England get on top of the asking rate of just over five an over and although he and Joe Root fell when apparently set for more substantial scores the result was rarely in doubt before the rain set in for good.

"It was really pleasing to get a score like that, and it was pleasing too that we could knock off the runs," Roy said. "Overall it was a great performance from the boys, we kept them below par, shame not to knock off the runs but we'll take the win. I thought we were outstanding with the ball."

Azhar Ali, Pakistan's captain, conceded that his side were at least 30 runs short, having failed to summon a more explosive finish to their innings. Azhar ended a run of 12 innings without an ODI fifty but was dismissed for 82 with 14 overs to go and his side could only managed to post 260 for 6 despite a sprightly fifty from Sarfraz Ahmed.

"Obviously we always look to score 300, but definitely 280-290 [was needed]," he said. "One of your top order has to score and bat long, triple figures would be nice and you always build a total when the top order perform. I would have loved to continue but we had to make up for a lot of dot balls, especially in the middle part."

Alan Gardner is an assistant editor at ESPNcricinfo. @alanroderick