Cheteshwar Pujara cracked an unbeaten century against Karnataka to steer Saurashtra into the semifinals.

Chasing a stiff target of 325 set by their rivals, Saurashtra romped home by making 327 for five in the last session of play at the Brabourne Stadium.

Pujara remained unconquered on 112 in 224 balls with 15 hits to the fence after forging crucial and successive partnerships with three left handers -- veteran Sitanshu Kotak, who made 87, all rounder Ravindra Jadeja (55) and captain Jaydev Shah (55 not out) -- to guide his side home.

The 20-year-old right-handed batsman, who has been in roaring form in the domestic championship this season with a tally of over 750 runs before this tie, put on a vital stand of 163 runs for the fourth wicket with Kotak, who struck 12 fours in his 147-ball stay.

Their stand rescued Saurashtra, who trailed Karnataka by 116 runs in the first innings, from a precarious position of 13 for three in the morning and helped them turn the match around in fine style.

After Kotak's fall at 176, Pujara had another left hander for company in Jadeja, who had already made his mark by taking nine wickets in the match, and the duo stitched together a stand of 77 runs in only 78 balls to put Saurashtra on the path to victory.

Pujara and the belligerent Shah, who struck nine fours and a six in his 43-ball unbeaten cameo, then piloted their side home with an unfinished stand of 74 runs.

Saurashtra will meet West Zone rivals Mumbai in the semi final in Chennai from January 4-7.