A record $4.9 billion was bet, also known as the casino’s handle, on sports in Nevada in 2017, according to the UNLV Center for Gaming Research, growing more than 440 percent from $894,564,000 in 1984, the first year that the figure was tracked. Additionally, sports made up a record 2.15 percent of the state’s overall casino winnings in 2017, up from 0.68 percent in 1984.