At the 68th minute, Mumbais Australian recruit Troy Sutherland slotted one home from a goalmouth melee but it was disallowed after a video referral.
Earlier Delhi scored through Vikramjeet Singh (13th minute) and Shakeel Abassi (35th), while for Mumbai, Ajmer Singh (15th) sounded the board.
Delhi earned three points to move to 13 points and join Chennai Cheetahs and Bhopal Badshahs at the table.
Vikramjeet Singh put Delhi ahead when he converted their first penalty corner in the 13th.
However, two minutes later, a defense lapse from Vikramjeet earned the Marines their first penalty corner and Ajmer Singh didnt make any mistake and brought up the equaliser.
In the 17th minute, Delhi earned their second short corner but the hosts failed to capitalise the opportunity as the two teams went into the break locked 1-1.
After a fierce battle in the second quarter, Delhi finally got ahead of the Marines in the 35th minute when former Pakistani captain Shakeel Abbasi slotted one home with a reverse hit inside the D from the left flank.
The third quarter also saw plenty of action but Mumbai's repeated attempt to bring up the equaliser was thwarted by the hosts. The wizards too got enough opportunities to increase the margin but they failed to capitalise on the chances.
In the fourth quarter, Mumbai had better ball possession but they still couldnt find that one goal.
Former India captain Rajpal Singh made a brilliant counterattack in the 67th minute but couldnt beat the goalkeeper. A penalty stroke was awarded initially to the wizards but was rolled back after a video referral.
One minute later, Sutherland pushed one home on his second attempt but it was disallowed after a video referral by the Wizards.
Just seconds before the final hooter, Mumbai had another chance when they earned a penalty corner but they failed to convert.
Delhi Wizards will now take on Chandigarh Comets at Chandigarh on Tuesday, while Mumbai Marines will face Sher-E-Punjab at Jalandhar on Wednesday.
Chandigarh Comets edge Pune Strykers 4-3 in a thriller
In Chandigarh, Canadian import Sukhwinder Singh Gabbar scored of a penalty stroke in the dying moments to help hosts Chandigarh Comets eke out a thrilling 4-3 victory over Pune Strykers on Monday.
Going into the fourth and final quarter 3-3, both teams were looking to score but couldnt make any breath thorough. But barely few seconds before the final hooter, a penalty stroke came Chandigarhs way and Sukhwinder made no mistake.
The Pune team made an aggressive start and pumped three goals in first eight minutes of the opening quarter.
Damandeep Singh deflected a pass from Ajitesh Roy in the 3rd minute of the first quarter and in the 6th minute Simrandeep Singh scored from a penalty corner.
In the 8th minute, Gurpreet Singh made it 3-0 up after
Chandigarhs Gurjinder Singh pushed Punes Damandeep resulting in penalty stroke being awarded.
However, Chandigarh were waiting to take revenge and their skipper and Pakistan international Rehan Butt scored in the 14th minute finishing off a good attack from the left flank involving his teammate Gabbar.
Despite being 1-3 down, local favourites Chandigarh again
playing before a thin home crowd fought back strongly and
dominated the second quarter, with Gurjinder Singh scoring for them in the 16th minute from a penalty corner.
At half-time, Chandigarh was a goal down, but in the 3rd minute of the third quarter, Gabbar scored the equaliser.
The final quarter saw some desperation from both sides to score, but each frittered away couple of golden chances that came their way.
Chandigarh failed to capitalize on the two penalty corners they got in the fourth quarter, while Pune also failed to score from the one they got.
From their nine matches so far, Chandigarh have won five, while Pune have won three from equal number of matches.
Today's Matches (March 20)
7.00 pm Chandigarh Comets vs Delhi Wizards (Chandigarh)
9.00 pm Chennai Cheetahs vs Bhopal Badshahs (Chennai)