And after signing with the Bucks past year for their biannual exception, worth $3.4 million, Lopez became an essential part of Milwaukee's remarkable turnaround this season and its elite units at both ends of the court.
The Pacers will send a first-round pick and two second-round picks to the Bucks in exchange for the combo guard.
Brogdon averaged a career-high 15.6 points and 4.5 rebounds while shooting 50.5 percent from the field.
The 31-year-old Lopez spent last season with the Bucks, helping Milwaukee earn the No. 1 seed in the Eastern Conference.
Lamb, meanwhile, had a career season with Charlotte in 2018-19.
For the Bucks, the entire National Basketball Association offseason was about their three most important free agents.
Replacing Brogdon will be easier than replacing either Lopez or Middleton, but there's no question that losing the superb role player will make the Bucks worse next season.
Milwaukee will be expected to contend once again in the East next season thanks to the continued development of MVP Giannis Antetokounmpo, plus a solid supporting cast.