It's that time of year...the time of year to be thankful that Wimbledon has a roof on Centre Court. 2019 champion Novak Djokovic gets his 2021 campaign under way here against Jack Draper, the British teenager who got a wildcard into the main draw.

Not bad for Jack Draper, though - a set off Novak Djokovic on Wimbledon's Centre Court.

DJOKOVIC 4-6, 6-1, 6-2, 6-2 DRAPER: Draper looks a little forlorn at the start of this game, which is unsurprising. It's been a heck of a day for him. Djokovic finishes with an ace to wrap things up.

DJOKOVIC 4-6, 6-1, 6-2, 5-2 DRAPER: A hold to love for Draper, but that just means the match is now on the Djokovic racket.

DJOKOVIC 4-6, 6-1, 6-2, 5-1 DRAPER: A serve down the Draper throat after a slightly nervy game, and Djokovic is one game away.

DJOKOVIC 4-6, 6-1, 6-2, 4-1 DRAPER: Lovely winner down the line to wrap up another break. We are moving inexorably towards the end.

DJOKOVIC 4-6, 6-1, 6-2, 3-1 DRAPER: It looked like Draper was making inroads on the Djokovic serve again for a moment there, dragging it to 30-all, but the Serbian is having none of it now he's cruising.

DJOKOVIC 4-6, 6-1, 6-2, 2-1 DRAPER: Draper opts to serve and volley at break point down - and it bears fruit, back to deuce. He plays a smart dropper and a good cross-court shot but there's not much you can do when Djokovic is on form, which he is now.

DJOKOVIC 4-6, 6-1, 6-2, 1-1 DRAPER: Sometimes Djokovic serves just like a tennis ball machine. That's what he does here on game point.

DJOKOVIC 4-6, 6-1, 6-2, 0-1 DRAPER: Nice for Draper to get that first game on the board in this fourth with a hold.

DJOKOVIC 4-6, 6-1, 6-2 DRAPER: And there is the third set as Djokovic moves ahead. He looks more like what we were all expecting now.

DJOKOVIC 4-6, 6-1, 5-2 DRAPER: Draper is wobbling a little now, and Djokovic scents blood.

DJOKOVIC 4-6, 6-1, 4-2 DRAPER: Djokovic is practically impregnable on serve now.

DJOKOVIC 4-6, 6-1, 3-2 DRAPER: Nice cheer from the crowd as Draper holds his serve thanks to Djokovic hitting it long.

DJOKOVIC 4-6, 6-1, 3-1 DRAPER: Hold to love for Djokovic.

DJOKOVIC 4-6, 6-1, 2-1 DRAPER: Oh, that's the most unfortunate shot I've seen in a while from Draper, trying to save break point. He misjudges the flight of the ball when going for a smash and misses it, it bounces out, and Djokovic has the break.

DJOKOVIC 4-6, 6-1, 1-1 DRAPER: Quick service hold from Djokovic.

DJOKOVIC 4-6, 6-1, 0-1 DRAPER: Draper takes the first tumble of the third set. It must still be very slippy out there, with all the people under the roof and the rainfall over the last 48 hours.

DJOKOVIC 4-6, 6-1 DRAPER: Well, that's a turnaround in the second set, but just what you'd expect from the defending champion. He's getting himself in the zone and although Draper is still playing some excellent shots and staying in the rallies, the world number one is beginning to stretch his legs.