Just for the record, I actually favour Johansson over Roddick. I don't hate either of them in particular. However, I didn't like the way Roddick carried on with the umpire and match officials on some occasions - although he might have had a point - you don't use that kind of language on live sports which are broadcast.
I did enjoy watching Johansson serve. His height and reach made serving look easy and his serves were unreturnable.
The weakness of Johansson - as it is for Cilic, Raonic and Del Potro is the ball which comes through to them at below one third knee height. They are very difficult for a tall player to dig out and return with enough control and power.
If a player wants to concede or forfeit a point, a game, a set, or a match, why don't they have the power to do this?
The umpire has the power to take a point, a game, a set or a match from a player for certain violations - subject to the tournament or International Tennis Federation rules.
Also, I don't have a view regarding the question and haven't voted and I think their are flaws with changing the scoring system and flaws with not changing the scoring system.
The idea of a score based on the standard sets won / lost (perhaps a percentage ratio) and / or the standard games won / lost (perhaps a percentage ratio) and / or the standard points won / lost (perhaps a percentage ratio) to determine the winner - including leaving the set score as a 6-6 draw - then simply moving to the next set - with no tiebreakers played - would be based on a formula of all three in certain ratios - all combined. During a professional match where statistics are kept in real time, they would be shown in real time on a scoreboard. The players may not be able to process exactly what they need to do to win. The advantage of this is that the player must try their best at all times to maintain their lead as the effects of the formula would be unpredictable. For example, the weightings of the total sets scores and total games scores may be higher than the weighting for the total point score or vice versa - or any combination thereof.
In some olympics events where there are heats, quarter finals, semi finals and then finals, you could set a world record in the heats and then not go through to the finals or get an olympic medal. A lot would view this as unfair and making a mockery of the credibility of the event.