The decisive blow for Delhi, who ended the three-team North Zone round robin on home and away basis with three wins and a lone loss (3 points), was struck by a not fully-fit Kevin Anderson of South Africa who easily overcame a tired-looking Spaniard Tommy Robredo, playing his third match, 6-1 in the fifth rubber when match scores were tied 2-all.
The bean-pole-like 28-year-old South African, currently ranked 16th in the world, jumped to a 4-0 lead in a jiffy with his strong serves and powerful ground shots.
Delhi's game-wise advantage over Mumbai at the end of the clash stood at a commanding 27-21, according to tournament supervisor Nitin Kannamwar.
Overall, Delhi have won 11 matches (sets) and lost 9 as compared to Mumbai's poor 6-9 and third team Punjab Marshals' 8-7 ahead of the dead rubber between Mumbai and Punjab.
The League organisers have said in a media release that the winners of North and South group round robin matches (ties, according to Kannamwar) would be decided by number of matches won and lost.