It was win number 162 for Dunn (19), one more than the tally for Maurice McKendry in the 1988-89 season. Eight weeks of the season remain.
Dunn added two further wins yesterday behind Diomedes and Lightning Raider. His trio of winners are trained by his West Melton employer, Cran Dalgety.
Dunn threaded Lightning Raider through gaps in the home straight after appearing hopelessly placed back on the inner.
Dunn has driven in 1063 races this season and also had 111 second placings and 111 thirds for $1,708,134 in stakes.
McKendry was 34 when he won the title from 877 drives for stakes of $1,207,477.
Dunn won the group one $200,000 Two-Year-Old Emerald on the Dalgety-trained Smiling Shard at Ashburton on Saturday.
He also drove Smiling Shard to win the group one Sires' Stakes Final at Addington last month.
Dunn has a lead of 81 wins over Mark Jones in the drivers' premiership. He topped the premiership last season with 146 wins. It was his second season of driving.
• Joshua Mac set a New Zealand record for a 2yr-old pacer over 2400m (mobile) when he won in 2.59.9 at Ashburton.
Joshua Mac was 0.1sec inside the record set by Lavros Voodoo in the NZ Sapling Stakes at Ashburton on June 3, 1996.
Joshua Mac was having his third start. He is trained by Robert Dunn for Clive and Rona McKay, of Christchurch.
The son of Christian Cullen-Hot Shoe Shuffle was a $200,000 purchase at the 2008 Australasian Classic Sale.
He is the first foal of Hot Shoe Shuffle, the winner of 13 races including Yearling Sales Paces at two and three and the 2002 North Island Breeders Stakes.
• Lucky Nova, a maiden trot winner at Ashburton in her first race for two years, has come full circle with her Leeston owner-trainer-breeder, Jeff Wheeler.
Wheeler qualified Lucky Nova at Ashburton in March, 2007. He then sold the daughter of S J's Photo and Kayla Novander to clients of the stable of Tim Butt and Phil Anderson.
Lucky Nova was placed in three starts from her new quarters before she went sore in a hind leg.
"I saw her advertised for sale and decided to buy her back," Wheeler said.
Wheeler and his father, Les, have been breeding from the family with success for 30 years.
Lucky Nova, now a 5yr-old is a half-sister to Cracker Nova (10 wins), Kayla Nova (five), Ollie Nova (four) and Fancy Nova (two).
Their dam, Kayla Novander, was unplaced in one race.
A daughter of Gee Whiz and Novander, she is a sister to Novander Whiz, the winner of 11 races.
Novander was by notable trotting sire Great Evander out of Edis Nova, who won 12 races for Les Wheeler when trained by Freeman Holmes.
Edis Nova won the 1973 NZ Trotting Stakes (now Derby) and a free-for-all on the fourth night of the 1975 Interdominion series in Auckland.
She was the first foal Les bred from Wavering Downs (by Meadow Chief), whom he bought as a broodmare in 1968.
• Pumped Up, a candidate for race 5 at Cambridge today, is now trained at Foxton by Peter Scaife.
The 8yr-old gelding was claimed for $2500 by horseman Ray Jenkins when he won at Washdyke on May 10.
