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The third match of the series will be played at Perth.
Keralite Sajana S top scored with 30 runs for Mumbai but RCB won by 7 wickets.
The 33-year-old hit four sixes in her knock, the last of which sailed over long on and crashed through the window of the car, which had been placed on a stage just behind the boundary rope.
RCB won by 23 runs after posting a formidable 198/3.
Australia got over the line with 21 balls and six wickets to spare with none of the Indian bowlers able to make any impact.
Kanika Ahuja and Ellyse Perry starred in the five-wicket win.
Ellyse Perry's fifty went in vain as the RCB lost by six wickets in Navi Mumbai.
Smriti, the most expensive player of the competition, has made only 80 runs in four matches.
Harmanpreet's 30-ball 46 and Richa's 19-ball 40 not out went in vain.
Annabel Sutherland, daughter of former Cricket Australia chief executive James, is likely to retain her place in the team after replacing Perry for the win over Bangladesh last Friday.
Results 1-10 of 14
