<div *ngFor="let report of reports">
  <div *ngFor="let team  of teams">
    <div *ngIf="report.teams_id==team.team_id">
      <div *ngFor="let master  of filteredMasters">
        <div *ngIf="master.teams_id==team.team_id">
          <div *ngIf="master.date <= report.report_date">
            {{master.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

masters: Masters[]
  filteredMasters = []

  private loadMasters() {
    this.mastersService.fetch().subscribe(
      masters => {
        this.masters = masters
        this.filteredMasters = this.masters.filter(masters => _.max(masters.date))
      }
   )
 }