Poland's Iga Swiatek and Germany's Alexander Zverev claimed titles at their home opens on Sunday.
Women's world number one Swiatek beat Germany's Laura Siegemund 6-0 6-1 in Warsaw to win the Poland Open.
Meanwhile, Zverev defeated Serbia's Laslo Djere 7-5 6-3 in the final of the Hamburg Open.
Swiatek only completed her semi-final earlier in the day after play was suspended on Saturday night because of bad light.
The 22-year-old was 6-1 5-5 up against Yanina Wickmayer at the time, and she eventually claimed a 6-1 7-6 (8-6) victory over the Belgian when the match was resumed.