Speedway Grand Prix: 'You've got to find his weaknesses' - Greg Hancock's message to Bartosz Zmarzlik's rivals

Greg Hancock says Bartosz Zmarlik's rivals have to "find his weakness" as the 2023 Speedway Grand Prix season gets underway on Saturday evening. Stream every round of the 2023 Speedway Grand Prix season live on discovery+, the Eurosport app and at eurosport.com.