"Illinois sportsbooks will not be able to take full advantage of the customer acquisition phase that comes with the beginning of every football season, which is vital for the growth of the industry," said Joe Boozell, lead analyst for PlayIllinois.com. "Because in-person registration was reinstated in April at the beginning of the slow season in sports betting, the industry has skirted the most severe effects of the state rule. But there will be no hiding from it during football season."

Bettors made $369.1 million in wagers at Illinois' retail and online sportsbooks in July, down 22.5% from $476.5 million in June, according to official data released Thursday. The day-by-day pace of betting fell to $11.9 million over the 31 days of July from $15.9 million over the 30 days of June. Handle was up 603% from $52.5 million in July 2020.

Gross gaming revenue fell 22.6% to $37.3 million from $48.2 million in June. That produced $37.6 million in adjusted gross revenue, yielding $6.1 million in taxes. At 10.1%, the market's hold, which is the percentage sportsbooks keep after paying out winning bets, remains relatively high.

July is typically the slowest betting month of the year in the U.S., marking the low point in U.S. betting in 2018, 2019, and now in 2021. Despite the slowdown, Illinois remained No. 3 in July in terms of betting volume, surpassed only by New Jersey ($578.7 million) and Nevada ($409.9 million).

"July features fewer prime betting opportunities and casual bettors are more occupied with vacations and other activities, and there isn't much sportsbooks can do about that," said Eric Ramsey, analyst for the PlayUSA.com network, which includes PlayIllinois.com. "Illinois sportsbooks have done well by increasing their hold over the summer months, which puts operators in a good position as casual bettors return."

Baseball was the most bet-on sport for the first time this year, drawing $124.0 million of action in July. That was down from $126.7 million in June.

July also marked the first time Olympics betting was made possible. Although Illinois does not report bets specific to the Olympics, anecdotally, it appears that the events in Japan did not draw widespread interest.

"With events held in the middle of the night in many cases and sports that are a bit unfamiliar to bettors, the Olympics did not appear to draw a lot of wagering," Ramsey said. "In the end, the traditional team sports are still by far the largest draw for bettors, which is why football is so important for sportsbooks."

July's wagering included $351.4 million in online bets, or 95.2% of the wagers made during the month. DraftKings/Casino Queen topped Illinois again with $122.7 million in combined online and retail handle, including $120.5 million online. In all, DraftKings generated $9.5 million in gross gaming revenue.

FanDuel accepted $118.5 million in online and retail wagers, $118.0 million of which came online. It all resulted in a market-topping $15.5 million in gross gaming revenue.

"FanDuel continues to wring out an impressive amount of revenue from the bets it takes in," Boozell said. "DraftKings answered with Same Game Parlays, which could help bridge the revenue gap with FanDuel. That fierce competition between the two market leaders will only grow during football season, with younger operators limited in their ability to make significant gains on the leaders with in-person registration in place."