Former world number one, Lleyton Hewitt, continued to defy age with a 30th career title at Hall of Fame Championships in Newport, while Spaniard, Roberto Bautista Agut won his second title of the year on the red dirt at the Mercedes Cup in Stuttgart.
Hewitt, a two-times Grand Slam winner, battled for nearly two and a half hours with Karlovic, the man who knocked him out of Wimbledon in the first round in 2003 as the defending champion, eventually winning, 6-3 6-7(4) 7-6(3) against the big serving Croat.
Third time lucky
It was a sweet victory for the popular Aussie ace after losing to Jon Isner and Nicolas Mahut in the two previous finals, and it was also his second Tour title of the year following his famous win over Roger Federer in the final of Brisbane in the beginning of the year.
Karlovic would have arrived in the final on the grass of Newport in a confident frame of mind after beating the Aussie in four of their five meetings however in true warrior fashion the Australian managed to hold off Karlovic despite serving 26-aces.
Grass court titles
Hewitt has now won eight grasscourt titles, second only to Roger Federer amongst players currently active on Tour.
After his win, Hewitt told reporters,"I felt relief to have finally won here."
"For me, I've come here the last three years and have come awfully close the last two years. It's nice to be rewarded today."
"We had tough conditions today, especially for serving," Hewitt said of the gusty winds. "I was just trying to play clean tennis as much as possible. From the baseline I was able to adjust to (the) wind better than him."
Hewitt also lifted the doubles title with fellow Australian Chris Guccione when they registered a 7-5 6-4 over Israel's Jonathan Erlich and American Rajeev Ram.
Hewitt in action against Murray
On the red dirt of Stuttgart, Spaniard, Roberto Bautista Agut defeated Lukas Rosol, 6-3, 4-6, 6-2 to lift his second title of the year at the Mercedes Cup.
Rosol hit 13 aces and won 78 percent of points on his first serve however only managed to convert one break point from six opportunities.
Bautista Agut has now won twice on the ATP Tour, both wins coming this season, his first on the grass of Den Bosch just ahead of Wimbledon.