In the very 1st video the image is stretched. It is not sped up. The mercedes logo on the net is a slight oval because the video has been stretched to fill up the youtube video.
It makes Sampras look like hes running faster and makes everyone look a little beefier and chunkier. Any other youtube videos from of tennis from 1990s in widescreen may also be stretched.
This video is better its not stretched. Instead the person cut the top and bottom off of the video so that it completely fits the wide screen. No stretching no distortion.