England skipper Stuart Broad said a slipshod final 10 overs in the field were to blame for their 15-run loss to West Indies in the first one-day international in Antigua.
The tourists chose to field upon winning the toss and made a great start, reducing the hosts to 45-4 as spinners Joe Root, James Tredwell and Moeen Ali all took wickets.
The West Indies were still only 153-5 after 40 overs but they finished with 269-6 thanks to Dwayne Bravo (87 not out) and Darren Sammy (61), who made hay in the closing stages.
England then got themselves into a fine position with the bat, thanks to a brilliant debut century from opener Michael Lumb (106).
However, having reached 180-2, they began to lose wickets at key times and finished short, on 254-6.
Broad said: "Certainly, the first 30 overs our spinners were awesome and, to pick up four wickets, we put ourselves in a fantastic position.
"I think we conceded 100 off the last seven overs and, while a lot of credit has to go to the West Indies batsman, we have to look at ourselves and get better there.
"We didn't react to the conditions as well as we could have done there.
"Both innings, we were brilliant for 40 overs in each, and then struggled a little bit. With the start we had when we batted, we really should have got those runs.
"But I wouldn't look too much at the batting. It was the last 10 overs with the ball which really hurt us. We need to speak as a bowling unit about getting better there.
"If we had given the batsmen 230 to chase, we'd have won the game. It's about cutting out the mistakes at the end of the innings with the ball because , other than that, we were fantastic with the ball.
"I really enjoyed how the spinners reacted to being asked to do slightly different things - in the powerplay and Rooty opening up.
"It's something other countries seem to do, but we're quite 'English' about it.
"I thought the spin at the start worked really nicely and is something we can carry forward."
But Broad confessed that the pace bowlers had a few problems with the rulings on wides.
"If I'm brutally honest, we had quite a strong plan to bowl wide yorkers and get the guys hitting into the big wind, and we got done a little bit by not knowing the rules, I suppose," he said.
"It was a bit confusing out there but, if the batsman stands outside off-stump, then the line doesn't move.
"Bresy (Tim Bresnan) got a little bit confused as to where the line actually belonged.
"I'm still not 100 per cent sure and I need to clarify it myself, but you might not see a lot of wide yorkers on Sunday."
However, Broad was keen to stress the positives and praised Lumb and his fellow debutant Ali, who also opened and made 44 out of a first-wicket stand of 96.
"It's not doom and gloom," said the captain. "We've lost this game but we did a lot of good things. Lumby's hundred on debut is a huge achievement for him and everybody's delighted for him. It was a fantastic knock.
"The two debutants you really could not fault. I thought they played beautifully.
"We have had a couple of games recently where we have lost games we really should have won. There are things we have to get better at but you have to lose games to learn how to win the high pressure ones. We need to learn quickly."
Dwayne Bravo was understandably delighted with his side's display. He said: "It was a great team effort, we didn't get the start we wanted with the bat but the partnership between myself and Simmons really laid the foundation that allowed Sammy to come in and play his natural game.
"As long as we show that character, that fighting spirit, we can't fault the guys. Anything over 250 we back our bowling group to defend that any time, so congrats to everybody."