The Indian women cueists also added to the Indian celebrations when Chitra Magimairajan and young Amee Kamani also qualified for the knockout stage. Manan Chandra, one of the most talented cueists in the country, scripted his third consecutive win to inch closer to qualify in the next stage.
Title favourite Advani made his way through by fighting a hard and long battle to oust compatriot Luky Vatnani 4-2, while Chawla overwhelmed New Zealand's Paul Bason 4-0 in their fourth-round matches.
However, Advani fought his way back with scores of 57, 52 and 68 between fourth to sixth frames to pocket the match.
"I am happy to come through this match. Lucky played good safety game, but I couldn't adjust to the conditions at the start. However, I thought I played well in the latter part of the match," Advani, who has won 12 world titles, said after the match.
With top four players from each of the six groups to qualify for the knockout stage, both Magimairajan and Kamani were assured of their slots in the round of 24.
Chandra posted a unblemished 4-0 win over Kiwi veteran Paul Bason, which helped him to warm up for the big matches ahead in the championship.
The 33-year old Delhi-based Chandra, whose performances since winning the 2006 National title have done little justice to his talent, did as he pleased against Bason.
Asian champion Thor Chuan Leong of Malaysia, who was surprised 1-4 by Egypt's Mohamed Khairy earlier in the day, put his campaign back on track defeating Belgian Jurian Heusdens 4-2 in a late night match. For women, it was yet again a clinical performance from Ng On Yee beating Anastasia (Russia) 3-0.
