aggregate SO 38255279

db.matches.aggregate([{
    $match: {
      $or: [{
        $and: [{
          "tournament": "Wimbledon"
        }, {
          "sets.tiebreak": true
        }]
      }, {
        $and: [{
          "tournament": "Roland Garros"
        }, {
          "sets.tiebreak": false
        }]
      }]
    }
  }, {
    $unwind: '$sets'
  }, {
    $match: {
      $or: [{
        $and: [{
          "tournament": "Wimbledon"
        }, {
          "sets.tiebreak": false
        }]
      }, {
        $and: [{
          "tournament": "Roland Garros"
        }, {
          "sets.tiebreak": true
        }]
      }]
    }
  }, {
    $group: {
      "_id": "$_id",
      "tournament": {
        $first: "$tournament"
      },
      "player1": {
        $first: "$player1"
      },
      "player2": {
        $first: "$player2"
      },
      "sets": {
        $push: "$sets"
      }
    }
  }])