South African fans celebrated on the first day of the UCI BMX World championships at the Royal Showgrounds in Pietermaritzburg as nine year old Johannesburg schoolgirl Georgina Grassie became the nation's newest world champion when she won her 9 Girls main final to give the host nation their first title of the champs.

Grassie was all smiles, and danced cheekily on the podium after holding off a concerted charges from Kiwi girls Jesse Smith and Mikayla Bearman to scoop the world number one title, as South Africa bagged three medals on the opening day, raced under grey skies and in chilly winter conditions.

Durban racer Axel Webster grabbed the silver medal in the 11 Boys main final, while the third medal came from Nicole von Munster in the 10 Girls final.

New Zealand racers were dominant in the junior challenge classes, winning golds in the 13 Girls through Tahlia Hansen, 5,6 Boys through Lachlan Stevens Mcnabb, with the 7 Boys gold going to Rico Bearman.

There were load cheers for Zimbabwean riders, who enjoyed neighbourly support from the local crowd as Tyler-Shae Donaldson (5-6 Girls) and Tayne Turnock (9 Boys) scooped world titles. US riders took home three junior world titles for world number one Julian Dittrick (8 Boys), Michael Gonzalez (11 Boys) and the stand-out junior rider Colin Hudson (13 Boys).

Grassie's gold in the 9 Girls final crowned a thrilling start to the worlds, watched by a big crowd at the Royal Showgrounds. She took time to warm to the event, finishing third in her first moto, then a second earned her a place in the final, where she found her feet and raced away to an early lead, which, even under considerable pressure from the two new Zealanders, she never relinquished.

Australian Jaden Rice posted on of the strongest performances of the day. He shot through on the first berm turn to instantly turn the race into a dice for the silver medal. His compatriot Jake Tunney was just as dominant as he showed his peerless class in the 12 Boys final.

In the first girls final, Argentinean rider Cingolani Francesca fell heavily on the second straight after coming off the tabletop badly, and was stretchered off to receive medical attention. Ahead of her Zimbabwean Tyler-Shae Donaldson pulled off an audacious slice inside the first berm to slingshot into the lead, which she never looked like surrendering.

The girls racing finished with a decisive 1-2 for Japan, as Kanami Tanno capitalised on a start ramp holeshot to win the 10 Girls title, just a minute before  Saya Sakakibara added another gold in the 11 Girls decider.

The girls racing ended with a New Zealand double as Tahlia hansen and Abigail Fox ringfenced the top two spots on the podium early on in the 13 Girls final.

The afternoon session gave the big crowd a first glimpse of the form of the top elite men as they went through their first practice session on the track, and testing the start ramp and the big jump at the end of the second straight that catapults them over the challenger classes turning berm.

Sifiso Nhlapo gave his fans plenty to cheer about, while Olympic champ Maris Strombergs and Australian rising star Sam Willoughby proved that they are in top form for their showdown on the weekend.

The second day of the UCI BMX World Champs features the challenge class finals for the 14 and over juniors and the masters classes, followed by the elite junior men and women's time trials in the afternoon.

SUMMARY OF RESULTS
DAY ONE UCI BMX WORLD CHAMPIONSHIPS
5-7,8 GIRLS
1.Tyler-Shae Donaldson ZIM
2.Desree Barnes AUS
3.Darcie Taylor GBR

9 GIRLS
1.Georgina Grassie RSA
2.Jessie Smith NZL
3.Mikayla Beraman NZL

10 GIRLS
1.Kanami Tanno JPN
2.Laurine Citi FRA
3.Nicole van Munster RSA

11 GIRLS
1.Saya Sakakibara JPN
2.Dion Bromley AUS
3.Shanayah Howell ARU

12 GIRLS
1.Axelle Etienne FRA
2.Manon Veenstra NED
3.Merel Smulders NED

13 GIRLS
1.Tahlia Hansen NZL
2.Abigail Fox NZL
3.Annaliese Rokov AUS

5,6 BOYS
1.Lachlan Stevens Mcnabb NZL
2.Emilio Durini ECU
3.Ondrej Matejik CZE

7 BOYS
1.Rico Bearman NZL
2.Amakye Andersen USA
3.Luke Rossiter GBR

8 BOYS
1.Julian Dittrick USA
2.Shafath Moreeano ECU
3.Wyatt Bell USA

9 BOYS
1.Tayne Turnock ZIM
2.Reid Kuller AUS
3.Matthew Denslow ZIM

10 Boys
1.Jaden Rice AUS
2.Baptiste Viellard FRA
3.Broc Meter ZIM

11 BOYS
1.Michael Gonzales USA
2.Axel Webster RSA
3.Franco Ezeqiuel Soriano ARG

12 BOYS
1.Jake Tunney AUS
2.Paolo Cortez ECU
3.Giovanni Fini ARG

13 BOYS
1.Collin Hudson USA
2.Juan Carlos Diaz Serna COL
3.Brandon Te Hiko AUS