Defoe enhanced his prospects for the William Hill St Leger with a clear-cut victory in the Betfred Geoffrey Freer Stakes at Newbury.
Mattmu sprang as 25-1 surprise on just his second comeback run following an unsuccessful spell at stud by making virtually all the running in the William Hill Great St Wilfrid Handicap at Ripon.
William Buick will be out of action for a minimum of six weeks after his fall in America last weekend.
Ann Potts, who owned Cheltenham Gold Cup winner Sizing John with her husband Alan, has passed away after a long illness.
Shutter Speed is set to run in the Juddmonte International at York on Wednesday after being a late withdrawal from Saturday's Prix de la Nonette at Deauville due to rain-softened ground.