Memphis — What loomed as a blockbuster bout between two four-times Major champions ended up as a technical knockout as Brooks Koepka floored Rory McIlroy on the way to a three-stroke victory at the WGC-St Jude Invitational in Memphis on Sunday.

Koepka had McIlroy reeling with early blows in the final round and never eased up on his out-of-sorts rival at TPC Southwind as he underlined his world No 1 status. The American sank a series of clutch putts and carded a five-under 65 for his first victory in the World Golf Championships series...

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