Golf: Rahm ready for first start as top gun, Koepka seeks return to form

July 30, 2020 12:33 AMMEMPHIS (REUTERS) - Spaniard Jon Rahm will make his first start as world number one at this week's WGC-FedEx St Jude Invitational in Memphis where defending champion Brooks Koepka hopes to rediscover his form ahead of next week's PGA Championship title defence.