Lanning played a key role in Australia’s 3-0 whitewash over New Zealand.
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Lanning amassed 163 runs from the two games, including a Player-of-the-Match performance of 101* in the second match. She couldn’t lead the side in the final ODI as hamstring injury ruled her out of the fixture.
Overall, Lanning moved up four places in the rankings table and replaced West Indies captain Stafanie Taylor from the top.
This is the fifth occasion that Lanning has attained the top position, the last time being in October 2018. She has held on to the No. 1 batting slot in ODIs for a total of 902 days since reaching the first time in November 2014.
Rachael Haynes, who captained the side in the third ODI, also made significant gains. She leapfrogged seven slots to attain a career-best 13th position after finishing as the most prolific scorer in the series with 222 runs.
The women's ODI bowlers' chart is also headed by an Australian. With 8 scalps in the series, left-arm spinner Jess Jonassen strengthened her position at the top of the table.
Spinners Georgia Wareham (up from 35th to 24th) and Sophie Molineux (re-entered at 44th) have also made notable gains in the latest update.
For New Zealand, formerly top-ranked Amy Satterthwaite has re-entered the ODI rankings in the fifth position after scoring 111 runs in the series while former captain Suzie Bates has lost a place in the top 10.