WI captain Chris Gayle warned his side they must improve from their "terrible display" in the first ODI or risk a whitewash by Zimbabwe.

The tourists, who also won the Twenty20 International on Sunday, claimed a two-run victory defending a total of 254 for five in Guyana, despite West Indies reaching 99 without loss and 126 for one.

"Well done to Zimbabwe, they did well," Gayle said in the post-match presentation, broadcast on Sky Sports 4. "They wanted it more than us, you could see from the way they went about their batting.

"We got off to a good start, but it was a terrible display of batting at the end.

"If we don't learn, we're going to (continue to) get beaten. If we carry on like this Zimbabwe will beat us 5-0. It was a terrible display.

"We need to dig ourselves quickly out of this hole. There's a lot of things to put on the table and discuss."

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Opposite number Prosper Utseya insisted he was always confident his batsman had done enough.

"I said after we won the toss it was the average score, so we just believed we could get 250 and with the way we're bowling at the moment it would be enough," he said.

"I'm very proud of the guys. It was a good team effort.

"They're still a good side. For us to beat them we need to remain focused and retain discipline."

The next match of the five-game series is on Saturday, also in Guyana.