India produced a clinical all-round performance to thrash hosts South Africa by 88 runs in the first ODI of the ICC Women's Championship at Diamond Oval here on Monday. Opener Smriti Mandhana (84 off 98) scored a half-century while the pace duo of Jhulan Goswami (4/24) and Shikha Pandey (3/23) shared seven wickets between them to emerge as the architects of India's victory.