He scored 141*, 76*, 100* and was run out on 88 against Zimbabwe in the fifth and final match.
Fakhar Zaman took 18 innings to beat the likes of Viv Richards (West Indies), Kevin Pietersen (England), Jonathan Trott (England), Quinton de Kock (South Africa) and compatriot Babar Azam, who all took 21 innings, to reach the top spot in the list.
Earlier Pakistan had set Zimbabwe a daunting target of 365 runs, after Pakistan captain Sarfraz Ahmed won the toss and made a decision to bat first.in the final ODI of the five-match series in Bulawayo.
On a morning for batsmen, Imam-ul-Haq went on to reach his third century of the series, cracking eight fours and a six before he swung across the line and was trapped lbw by left arm spinner Wellington Masakadza for 110.
Pakistan's Fakhar Zaman on Sunday became the fastest batsman to complete 1000 ODI runs, reaching the landmark during the fifth One-Day match against Zimbabwe.
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Earlier this week, Fakhar Zaman became the first Pakistan batsman to hit a double century in One Day Internationals. Batting first, the visitors scored a mammoth 364 for 4.
It was a series to remember for the Pakistan opening batsman. The Pakistani pair's opening stand of 304 runs took them past Sri Lanka's Sanath Jayasuriya and Upul Tharanga who held the record up until then. He has converted all his fifty-plus scores into centuries so far! Skipper Hamilton Masakadza and Tinashe Kamunhukamwe put on a 66-run stand for the first wicket before Ryan Murray and Prince Masvaure added another 78 runs for the third wicket.
In the first half of his innings, Babar kept the runs ticking as he brought up his half-century off 55 deliveries.
Fakhar Zaman became the least experienced to break the 200-run barrier as he scored in his 17th ODI only. He paced his innings brilliantly - going from 50 to 100 in just 17 balls.