He was the first player to hit a perfect nine-dart finish during the Embassy World Darts Championship, which he achieved in 1990 during his second round match against Jack McKenna.

He beat Mohd Latif Sapup in the preliminary round 4–1 to set up a first-round match against second favourite for the tournament Michael van Gerwen.

[6] In the second round Lim lost to South Africa's Devon Petersen, but Harith beat Graham Filby, resulting in a doubles match to settle the tie.

[9] Lim and Harith made it to the second round of the 2016 World Cup, but lost their singles matches 4–2 to Austria's Mensur Suljović and Rowby-John Rodriguez.

[11] In the first round of the 2017 World Cup Lim and Harith met the number one seeds of Scotland represented by Gary Anderson and Peter Wright.

A 100 finish from Lim completed a huge 5–2 shock victory for Singapore and they then beat Spain 4–0 in a doubles match to make it through to the quarter-finals of the event for the first time.

[13] In the 2018 PDC World Darts Championship, Lim defeated Kai Fan Leung, and number 30 seed Mark Webster to set up a second round clash with Gary Anderson.