Ka Ying Rising broke his own track record for the third consecutive time when surging to an unprecedented 21 straight wins in Sunday’s Group Three HKSAR Chief Executive’s Cup (1,200m) at Sha Tin. David Hayes’ speed machine led all the way to knock almost an entire second off his previous mark of 1:07.10, recording a scintillating time of 1:06.11. Nine-time Hong Kong champion jockey Zac Purton piloted the world’s best sprinter to win by seven and three-quarter lengths over Copartner Prance in...