Nazeef did not run as a two-year-old and made her racecourse debut in a minor race over seven furlongs at Newmarket Racecourse on 8 June 2019 in which she was ridden by Nicky Mackay and finished third behind Nonchalance and Flarepath, beaten five and a quarter lengths by the winner. Nineteen days later she started 4/6 favourite for a seven-runner maiden race over the same course and distance and recorded her first success as she took the lead approaching the final furlong and won by one and a quarter lengths from the four-year-old gelding Ghalyoon. On 4 September the filly started at odds of 1/4 for a novice race over one mile on the synthetic Polytrack surface at Chelmsford City Racecourse and won "very easily" after accelerating away from her three opponents in the final furlong. For her final run of the season, Nazeef was returned to the turf for a handicap race over one mile at Newmarket three weeks later in which she carried top weight of 134 pounds and started 6/4 favourite. Ridden by Dane O'Neill she took the lead inside the last quarter mile and won in "impressive" style by six lengths from Salayel.
2020: four-year-old season
For her first run of 2020 Nazeef was stepped up in class to contest the Listed Snowdrop Fillies' Stakes over one mile on Polytrack at Kempton Park Racecourse. Owing to the COVID-19 pandemic the British flat-racing season was restructured leading to the race being run behind closed doors on 3 June and being open to three-year-olds. Nazeef started the 4/1 third choice in the betting behind her stablemate Scentasia and Billesdon Brook. After being restrained by Crowley for most of the way she made strong progress on the outside in the straight, overtook Billesdon Brook in the closing stages and won "cosily" by three quarters of a length. John Gosden's son Thady said "it was a very pleasing performance... she has strengthened and matured nicely this year. Hopefully she will continue to improve" while Crowley commented "She has done nothing but improve with every run she has had in the last year and she keeps getting better and better". Thirteen days after her win at Kempton Nazeef was moved up to Group 2 class for the Duke of Cambridge Stakes at Royal Ascot and started the 100/30 third choice behind the joint-favourites Queen Power and Jubiloso. The best fancied of the other seven runners was the Godolphin entry Magic Lily who had won the Balanchine and the Cape Verdi in Dubai. Nazeef raced in mid-division before staying on strongly in the last quarter mile and gained the advantage in the final strides to win by a head from the 28/1 outsider Agincourt. John Gosden commented "Nazeef is very genuine and did nothing but improve last year. She deserves a little rest... We won't rush her back but you'd love to see her have a go at a Group 1". Nazeef contested her first Group 1 race on 10 July when she started at odds of 9/2 for the Falmouth Stakes over one mile at Newmarket. Her stablemate Terebellum started favourite while the other four contenders were Billesdon Brook, One Master, Agincourt and Under The Stars. After racing in second place behind Terbellum Nazeef stayed on strongly in the final furlong and won in a blanket finish by a neck from Billesdon Brook with Terebellum the same distance away in third, half a length in front of One Master. After the race Crowley said "She's as tough as nails and she's improved with every run. That's six races in a row she's won now - she's climbed her way up the ladder. She's a really gorgeous looking filly as well, with plenty of size and scope about her".
