Though it has generated a lot of hype, Google Glass clearly has a way to go before it's a viable mainstream product.
But that hasn't stopped Google continuing to pour fuel into its hype machine, getting people excited - if ready to actually use one - about the idea.
Its latest attempt is this interesting, though stylised video of Roger Federer and Stefan Edberg playing tennis using the device.
Check out what it looks like to play probably the most talented man to ever pick up a racquet...