The 82nd-ranked Hewitt upset the 28th-ranked Dimitrov on the grass courts. Berdych made his first appearance at the pre-Wimbledon event since a first-round loss in 2005.
The sixth-ranked Berdych dominated the opening set and won 70 percent of the points. But after a short rain delay at the start of the second set, No. 91 De Bakker held six break points before Berdych earned a break to lead 4-3.