Mr Robertson, who’s username is Spotmeplzzz, had won 13 out of his last 18 matches in Madden NFL tournaments.
The 27-year-old from West Virginia was a father and husband and his EA Sports player profile describes him as “one of the toughest opponents in competitive Madden”.
Mr Clayton, 21 from California, has been described as a rising star who had a been having a rough season this year.
His EA Sports player profile describes him as “consistently one of the best in competitive Madden” and he “remains one of the best around and can potentially win it all when it’s done”.
Police have not named the victims, despite local media identifying them. There has been an outpour of tributes from the Madden gaming community.
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@youn_kiv tweeted: “RIP @True__818 Elijah Clayton. One of my best friends in life. I talked to u almost everyday for the last 5 years. U were one of the most kind and genuine people I’ve ever met.
“I love u like a brother. I’m gonna miss hearing you laugh everyday and seeing your genuine smile.”
@Deaonbrock shared a photo of Mr Clayton on Instagram with the caption: “RIP to literally one of the first people to ever support me in Madden, one of the first people to even watch my streams smh, so young and had his life taking away by a pussy smh RIP to SPOTME as well, the man had a wife and kid smh, EA has got to do better with these events, and we got to do better as a community #madden #trueboy#spotmeplzzz.”
@ashtonwhalen99.5 posted an image of the two victims on Instagram with the following caption: “Two of my top three favorite players you guys inspired me to work harder and get better at the game I love no matter how slowly it takes me you guys showed that no matter your situation you can be something I hope the best for both of your families and hope you may find peace; rest in power you guys I love y’all #trueboy #spotmeplzzz.”
Police are still trying to determine a motive after gunman David Katz opened fire at the Madden NFL Championship tournament at The Landing.
Witnesses have told local media that the 24-year-old from Baltimore, Maryland was a disgruntled gamer who was angry because he lost Sunday’s tournament.
It is unclear if Katz knew his victims.
The Jacksonville Sherif’s office said 11 other people were wounded by gunfire and at least two others were injured while trying to flee.
Police have not named any of the individuals who were injured but local media Action News JAX named three survivors.
Alex Madunic, George Amadeo and Chris McFarland all suffered gunshot wounds.
One had surgye on Sunday and one is due for surgery on Monday, and all three are stabilised.
Another victim Tim Anselimo was indentifed by his mother after saying her son was shot three times.
She then shared an image of her son in hospital with a “thumbs-up” sign to show that he is expected to live.
Police say Katz killed himself and his body was found near the bodies of Mr Robertson and Mr Clayton.
FBI agents and police have swarmed Katz’s townhouse in South Baltimore to look for clues, according to local newspaper the Baltimore Sun. The gunman’s car has also been seized by police.
The shooting happened at a regional qualifying tournament for the Madden 19 tournament.
It was hosted at the GLHF Game Bar inside a pizza restaurant.
The winners of the contest would go forward to the finals in Las Vegas to compete for a grand prize of £128,000 ($165,000).