The Scout's series on five players to back for Fantasy Premier League Gameweek 8 concludes.
It seems remarkable that last season's top points scorer is found in only 2.6% of FPL squads.
Sanchez topped the overall standings with 264 points in 2016/17.
But his impact and popularity have declined this term.
He will arrive at Vicarage Road on the back of his best display of the season.
Sanchez fired eight shots on goal against Brighton & Hove Albion, more than any other player in Gameweek 7.
He also created six chances in an all-round attacking performance that suggests he could again be a hit with FPL managers.
Watford will be mindful of the threat from Sanchez.
In the corresponding fixture last season, Sanchez produced a goal and two assists in a 3-1 Arsenal win.
That was typical of his away form.
Sanchez got 15 goals and six assists on the road, compared with nine goals and five assists at Emirates Stadium.
The Hornets have enjoyed an encouraging start to the season under head coach Marco Silva.
But their best form has arrived away from home, with three successive victories.
In contrast, Watford have gained only two points from their home matches, conceding a Premier League high of nine goals.
Only Stoke City (64) have allowed more shots in home matches and they have played one more fixture.
Even beyond Saturday's match, Sanchez could now be set for a burst of points with Arsenal's short-term fixtures improving.
Both rank among the weaker defences in the League, appearing in the top five for shots on target conceded with 33 and 37 respectively.
Sanchez scored or assisted 47.3% of Arsenal’s goals last season and he now looks poised to deliver.
Hinting at a return to his explosive best and with such low ownership, he is an FPL game changer in waiting.
Part 1: Harry Maguire
Part 2: Virgil van Dijk
Part 3: Raheem Sterling
Part 4: Pascal Gross