The Atlanta Hawks and Boston Celtics are the first known teams to secure face-to-face recruiting meetings with free-agent big man Dwight Howard, according to league sources. Sources told ESPN that Howard, 30, is likely to meet with as many as five teams in free agency, with a return to the Houston Rockets widely seen as unlikely after Howard declined his $23.2 million player option for next season. Teams can officially begin negotiating with free agents at 12:01 a.m. ET Friday. Howard will hold meetings in Atlanta on Friday, then in Las Vegas on Saturday, according to a league source. The Miami Heat, sources said, have not yet booked a meeting with Howard in free agency, but could emerge as a more serious Howard suitor after registering preliminary interest in him.  ESPN reported earlier Tuesday that the Hawks, while still trying to convince Kevin Durant to grant a face-to-face sitdown, have been weighing a run at Howard to pair...