Police and bailiffs clashed with protesters in Rushcroft Road, Brixton as the eviction at one of the properties got underway.
More top news
The 48-year-old man was held on suspicion of theft from heritage and protected sites.
A Met Police officer was left red-faced after attempting to stop a cyclist riding along a dedicated cycle path.
The number of people allowed into official spectator areas will be cut by a fifth with just 100,000 tickets available.