Keep your eye on the ball
A one-horse race
Move the goalposts
Flogging a dead horse
A level playing field
To be neck and neck
In the driving seat
A major player
Ahead of the game
On the ropes
Being in front of the competition
An important company or person with a lot of power or influence
Being in a very bad situation
Being the only competitor
A change in the rules
A situation of fair competition
Being in control
Being at the same level as the competition
Wasting your time on a hopeless situation
Staying focused