The 2004 Athens Olympic champion won the race in 12.87 seconds in an eye-popping performance in the lead-up to the London Olympics.
The time equalled Cuban Dayron Robles' 2008 mark but did not count as a joint record because he was assisted by a gust measuring 2.4 metres per second, just above the allowable limit of 2.0.
Liu's fastest official time remains 12.88, set in 2006, and which stood as the word record for two years.
US world indoor champion Aries Merritt finished second on Saturday in 12.96 with world outdoor champion Jason Richardson third in 13.11.
Former world champion Allyson Felix destroyed a solid 200m field, sprinting home in 22.23 seconds, while Wallace Spearmon claimed the men's race in 20.27
Earlier, Olympic 400m gold medallist LaShawn Merritt and 2004 Athens 100m Justin Gatlin both sped to victory.
Merritt ran down world champion Kirani James to win the 400 in 44.91 seconds.
James had run under protest after false starting. The protest was later dismissed, allowing Chris Brown of the Bahamas to be promoted as runner up in 45.24.
South African double amputee Oscar Pistorius, who is still seeking to qualify for the Olympics, finished last of the eight starters in 46.86.
Gatlin, undefeated this season, took the 100 dash in 9.90 seconds after a sluggish start, with Jamaican Nickel Ashmeade second in 9.93.
The times were well off the season-leading 9.76 Jamaican world record holder Usain Bolt set in Rome on Thursday.
Olympic bronze medallist Walter Dix was fourth in 10.04.