Young Baba Aparajith scored his maiden century in limited overs cricket as South Zone beat East by 11 runs in the Deodhar Trophy quarter-final, in Guwahati on Sunday.
South will now take on West Zone in the second semi-final slated on Tuesday.
Opting to bat at the Nehru Stadium in Guwahati, South Zone posted a healthy total of 284 for five in 50 overs riding on Aparajith's 121.
In reply, East managed to 273 for seven with skipper Wriddhiman Saha top-scoring with 77 and Ishank Jaggi managing to hit 55.
It was the 89 runs given by the East Zone bowlers in the final 10 overs of the South innings that turned out to be decisive.
Apart from Aparajith, the other notable contributor was former India opener Robin Uthappa who managed a patient 48 off 75 balls with six fours.
Having lost other opener Lokesh Rahul (0) in the very second over, Uthappa and No 3 batsman Aparajith added 95 runs for the second wicket before the former retired hurt.
Skipper Dinesh Karthik (33) joined Aparajith and they added 59 runs for the third wicket.
The late flourish was provided by Kerala's One-day captain Sachin Baby smashing an unbeaten 33 off 19 balls with five fours. The last five overs yielded 48 runs with India pacer Shami Ahmed giving away 60 runs in 11 overs.
Chasing 285, Wriddhiman tried his best as his 72-ball-77 had four boundaries and three sixes.
Brief Scores: South Zone 284/5 (B Aparajith 121, R Uthappa 48, S Baby 33 no, Shami Ahmed 2/60); East Zone 273/7 (Wriddhiman Saha 77, Ishank Jaggi 55,
Abhimanyu Mithun 3/40).
Photograph: Ian Hitchcock/Getty Images