Andy Ruiz Jr. – who pulled off one of the biggest upsets in boxing history when he TKO'd Anthony Joshua on Saturday night – has gained the respect of oddsmakers, although he's still priced as a substantial underdog in a potential rematch. While a rematch for the heavyweight championship has not yet been made, one sportsbook opened Joshua as a solid favorite for a second bout – just not nearly as big a favorite as he was in the first go-round. Offshore bet shop BetOnline installed Joshua at -350 (bet $350 to win $100, or 2/7 odds) and Ruiz Jr. at +275 (bet $100 to win $275, or 11/4 odds). The chunky Ruiz was a [10/1 underdog to beat Joshua](https://www.betchicago.com/anthony-joshua-upset-underdog-andy-ruiz-heavyweight-title) at Madison Square Garden on Saturday and 20/1 to win by knockout. The fight was stopped by referee Michael Griffin in a seventh-round TKO. Joshua, a -2000 favorite at Caesars, was beaten for the first time in his career, dropping his record to 22-1 with 21 knockouts. Ruiz, who is now 33-1 with 21 knockouts, knocked Joshua down four times, including twice in the final round. Ruiz was a replacement opponent for Joshua and had just six weeks to prepare for the powerful British champ. He was not considered a top contender, and his win reminded many of Buster Douglas’ 1990 upset of Mike Tyson as a 37/1 [underdog](https://www-usbets-com.cdn.ampproject.org/v/s/www.usbets.com/amp/douglas-tyson-sports-betting-myth?amp_js_v=0.1&usqp=mq331AQCKAE%3D#origin=https%3A%2F%2Fwww.google.com&prerenderSize=1&visibilityState=prerender&paddingTop=32&p2r=0&horizontalScrolling=0&csi=1&aoh=15595906596478&viewerUrl=https%3A%2F%2Fwww.google.com%2Famp%2Fs%2Fwww.usbets.com%2Famp%2Fdouglas-tyson-sports-betting-myth&history=1&storage=1&cid=1&cap=navigateTo%2Ccid%2CfullReplaceHistory%2Cfragment%2CreplaceUrl). Joshua said Sunday [he wants](https://amp-theguardian-com.cdn.ampproject.org/v/s/amp.theguardian.com/sport/2019/jun/02/anthony-joshua-rematch-andy-ruiz-jr?amp_js_v=0.1&usqp=mq331AQCKAE%3D#origin=https%3A%2F%2Fwww.google.com&prerenderSize=1&visibilityState=prerender&paddingTop=32&p2r=0&horizontalScrolling=0&csi=1&aoh=15595890196237&viewerUrl=https%3A%2F%2Fwww.google.com%2Famp%2Fs%2Famp.theguardian.com%2Fsport%2F2019%2Fjun%2F02%2Fanthony-joshua-rematch-andy-ruiz-jr&history=1&storage=1&cid=1&cap=navigateTo%2Ccid%2CfullReplaceHistory%2Cfragment%2CreplaceUrl%2Cswipe) an immediate rematch. Ruiz Jr. would be smart to accept it, since it would likely be a huge pay day for him. While the relatively inexpensive price on Joshua is sure to get the attention of sharp boxing bettors in a rematch, Ruiz proved he can beat Joshua, [pummeling](https://finance.yahoo.com/video/highlights-andy-ruiz-jr-stuns-183839297.html) the then-champion for much of Saturday night's fight. A fighter doesn't knock down another fighter four times by accident. Thus, even though Ruiz is offered at a far shorter price, underdog bettors will take their shots. __More coverage:__ [Check out our complete boxing coverage](https://www.betchicago.com/boxing)