The Spaniard made three saves in the 0-0 stalemate, while his 13 recoveries proved a key factor in returning 30 in the Bonus Points System (BPS).
Boro’s Ben Gibson (£4.9m) was able to collect two bonus points after registering eight clearances, blocks and interceptions (CBI).
The centre-back also completed 88% of 43 attempted passes, finishing with a BPS total of 28.
The right-back contributed five recoveries, won a single tackle and completed a dribble to score 26 in the BPS.
Gibson, who has played every minute of the season so far and is more than 30 points ahead of any defensive team-mate, is the standout option.
Valdes, meanwhile, has earned at least one save point in six of his last seven outings, strengthening his claims.
Swansea’s attempts to break down the visitors were hindered by the absence of striker Fernando Llorente (£6.6m).
He was the sixth most popular target in the FPL transfer market ahead of Gameweek 30, with more than 84,000 managers recruiting the Spaniard.
But his 14% ownership were left disappointed when he was ruled out due to an ankle injury.
His availability for Wednesday’s home clash against Tottenham Hotspur remains uncertain and Llorente has already been sold by over 43,000 managers ahead of Gameweek 31.