The strike hit the top of the tree just off the 16th tee shortly before 5 p.m., shattering the bark all the way to the bottom.
Paramedics treated the people injured and ambulances took them to hospitals for additional medical attention.
The lightning reportedly sent a bunch of debris flying, and that struck at least six people. one of whom was reportedly a child.
Ambulances streamed into the private club about 6 miles east of downtown Atlanta, where 30 players are competing for the FedEx Cup and its $15 million prize.
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Several of the spectators - who were on the green watching the Third Round of the championship event - were seen lying on the ground after the incident occurred late Saturday afternoon at East Lake Golf Club. "He said, 'Dude, I think someone got struck by lightning right next to us.' And then word started spreading".
The third round of the Tour Championship in Atlanta was suspended on Saturday following lightning strikes at East Lake which resulted in some spectators being taken to hospital, the PGA has confirmed.
"We had a situation where there were pop-up thunderstorms", Russell said in an impromptu press conference.
Added Tyler Dennis, the tour's vice president and chief of operations: "We have a professional meteorologist that's on site every week on all of our tours". So far, there has been no update regarding the condition of those affected by the lightning. One man was killed and five were injured from lightning at the U.S. Open at Hazeltine outside Minneapolis.