After that highly encouraging debut run, Lah Ti Dar was immediately stepped up to Listed class for the Pretty Polly Stakes at Newmarket, a race that tends to be a trial for the Epsom Oaks. Despite being keen throughout, Frankie Dettori took her to the front with a furlong out and despite running green, she drew clear in the final furlong to win eased down by three lengths.
As a result, she was a market leader for the 2018 Epsom Oaks but injury ruled her out of contention for the fillies’ Classic. Instead, she would wait till August of that year to return to the track, in more modest Listed company at York. Her return was extremely impressive on the eye, quickening away from Light Of Joy and Sun Maiden to land the Galtres Stakes on the Knavesmire by 10 lengths.
Having missed the Oaks, John Gosden would send Lah Ti Dar towards the final British Classic of the season - the St. Leger Stakes at Doncaster. Despite being over one mile and six furlongs - two further than Lah Ti Dar had ever raced before - and against three-year-old colts, she was sent off the 7/4 favourite.
She made headway to almost lead with three furlongs to run, but could only chase down Kew Gardens to within two lengths as the Ballydoyle colt stayed on best of all to claim the oldest Classic, with Lah Ti Dar back in second.
The final race of a busy three-year-old campaign saw Lah Ti Dar run at Champions Day at Ascot, in the Group 1 British Champions Fillies & Mares Stakes. Here she took on four-year-olds on ground softer than she had previously encountered, and it proved to be her undoing. Lah Ti Dar and Frankie Dettori would only finish third, behind another Ballydoyle horse in Magical.
As a four-year-old making just her sixth start, Lah Ti Dar won her first Group 2 race in the Middleton Stakes at York during the Dante meeting in May 2019.
Heavily backed at prohibitive odds of 1/3, Lah Ti Dar took a trademark keen hold under Frankie Dettori and was put under pressure inside the final two furlongs by Rawdaa and Ryan Moore. But the Dubawi filly pulled out more at the death to win by a diminishing neck.
15 days later, Lah Ti Dar (11/4f) would run in the Group 1 Coronation Cup at Epsom, and would go off the favourite for the seventh successive race.
Up in class against Group 1 winners including St Leger winner Kew Gardens and Dubai Sheema Classic winner Old Persian, Lah Ti Dar was held up in midfield but never looked likely to contend and plugged on to finish a very moderate sixth.
After that Epsom disappointment Lah Ti Dar would not go off favourite for her next race - the Grand Prix de Saint-Cloud at the French track on June 30. Frankie Dettori chose to partner her stablemate Coronet for the 12-furlong test and his decision was proved right as she clinched victory. Lah Ti Dar (47/10) meanwhile - this time ridden by Ryan Moore - finished a close third after holding every chance two furlongs out.