[3] He rose to international prominence by winning the IBSF World Amateur Billiards Championships in 1985, versus Bob Marshall in an eight-hour-long final round.

[2] In the 2006 event, in Prestatyn, Wales, he defeated David Causier in the quarter final, and defending World Pro Champion Chris Shutt in the semi-final.

He won the title round 2073–1057 (average per inning 34.3 vs. 17.0) in a timed five-hour final against Lee Lagan (who had previously beaten him 6 frames to 5 at the untimed 2003 IBSF Amateur World Championship).

[4] Sethi won gold and silver medals in doubles and singles English billiards respectively at the 13th Asian Games (1998, Bangkok, Thailand).

[5] He also won silver and bronze medals in doubles and singles English billiards respectively at the 14th Asian Games (2002, Busan, South Korea).

Sethi's professional management agent, TNQ Sponsorship,[3] commented that he "has been focussing[sic] on the sport with renewed enthusiasm" and "seems to be peaking at the right time".