Chasing a target of 270, India U-19 won the match in only 39.3 overs losing six wickets courtesy Sarfaraz and Ricky Bhui who cracked 94 not out.
This was India U-19's second successive win in the tournament having beaten Zimbabwe in the opening encounter.
Sarfaraz, the youngest member of this India U-19 team cracked 17 boundaries and a six during his scintillating knock.
The duo came together when the hosts were in trouble at 93 for four and when Sarafaraz was out in the 36th over, the match was in India's kitty. Bhui finished the match with a big six.
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The day belonged to young Sarfaraz, who has been a big name in Mumbai's competitive school circuit. Sarfaraz and his eight-year old brother Musheer (youngest to get five wickets in Mumbai's Kanga league game) have shown knack of breaking records.
Earlier, Indian pacers Abhimanyu Lamba (3/55) and Chama Milind (3/52) shared the maximum of the spoils as South Africa scored 269 for eight in 50 overs after opting to bat. Clyde Fortuin (90) and Llyod Brown (69) were chief contributors.
In another round robin league match, Australia U-19 thrashed Zimbabwe by 147 runs.
Brief Scores: South Africa U-19 269/8 in 50 overs (Clyde Fortuin 90, Llyod Brown 69, Chama Milind 3/52, Abhimanyu Lamba 3/55).
India U-19 275/6 in 39.3 overs (Sarfaraz Khan 101, Ricky Bhui 94). India U-19 won by 4 wickets. Pts: India 4, SA 0.