© Kate Lucey / International Tennis Hall of Fame

Guido Andreozzi wins his sixth match of the season on Monday.

Andreozzi Upsets Former Champion Karlovic In Newport

Isner leads the ATP 250 field

Argentine Guido Andreozzi scored the upset of the day on Monday at the Hall of Fame Open in Newport, dismissing 2016 champion Ivo Karlovic 7-6(5), 7-6(6).

Neither player earned a break of serve, but the 27-year-old Andreozzi earned one mini-break more in each tie-break to reach the second round. Karlovic, also a two-time finalist in Newport (2014-15), fell to 17-7 at the grass-court event and was going for his second ATP Tour final of the season (Pune).

At Wimbledon, the 40-year-old Croatian beat Andrea Arnaboldi to become the oldest match winner there since Ken Rosewall in 1975. Andreozzi will next meet German Mischa Zverev or American qualifier Tim Smyczek.

You May Also Like: Hall Of Fame Open: All You Need To Know

Poland's Kamil Majchrzak, who pushed Kei Nishikori to five sets at the Australian Open, will face top seed John Isner in the second round after dismissing Brit wild card Alastair Gray 6-3, 6-4.

Isner owns a 19-5 record in Newport, where he has won three of his 14 titles. The top American returned at Wimbledon after missing three months because of a broken foot suffered in the Miami Open presented by Itau final (l. to Federer).

American Tennys Sandgren fought for a win in his first-round match, prevailing against Denis Istomin 6-4, 5-7, 6-4 to set up a second-round meeting with second-seeded Frenchman Adrian Mannarino. Sandgren knocked out World No. 10 Fabio Fognini en route to the Wimbledon Round of 16.

Spaniard Marcel Granollers will next confront No. 3 Jordan Thompson after dismissing India's Prajnesh Gunneswaran 6-2, 6-2. Meanwhile, Ilya Ivashka of Belarus knocked out Aussie Bernard Tomic 6-2, 7-6(5) and will face defending champion and fifth seed Steve Johnson or American wild card Christopher Eubanks in the second round.

Watch Live

More stories like this in: