Titles in Brisbane and on home soil in Sofia sandwiched Dimitrov's second Grand Slam semi-final at the Australian Open, where he came agonisingly close to beating Rafael Nadal.
The Bulgarian, who won the Queen's Club title in 2014, suffered only his second defeat of the year to David Goffin at the ABN AMRO World Tennis Tournament in Rotterdam last week.
But the 25-year-old believes he is a better player than when he beat Andy Murray at Wimbledon in 2014 and has targeted success on grass.
