It was just another great day at the office for most of the top names as they continued their campaigns on Tuesday in China and Japan. These are the Top 5 photos that sum up the action.

1. Novak Djokovic had a great day at the office in Japan. The No. 1 seed rallied past Alexei Popyrin in his Tokyo opener 6-4, 6-2. The 16-time Grand Slam champion will next face wild card Go Soeda in the second round. It was a positive first match back since retiring in the US Open's fourth round against Stan Wawrinka due to a left shoulder injury.

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Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

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2. A little more than a week after winning the Osaka crown, Naomi Osaka has maintained her form at the China Open. The two-time major champion was all smiles, keeping her winning streak alive by dismissing Andrea Petkovic 6-2, 6-0, to advance into the third round. The world No. 4 will face American Alison Riske, who is arguably having the strong season of her career.

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

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3. Elina Svitolina helped tournament organizers celebrate their country's National Day following her second-round victory. The Ukrainian survived two tight sets to claim the match, 7-6 (5), 7-6 (1), over Wang YafanThe No. 3 seed will face American Sofia Kenin for a spot in the quarterfinals.

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

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4. Zheng Saisai ousted No. 13 seed Sloane Stephens, 6-3, 6-1, to set up a third-round clash against top-ranked Ashleigh Barty. Dropping only four games, Zheng played some of her best tennis in front of her home crowd in China. The world No. 39 is reaching new heights this season after claiming two titles this yearincluding one at the Premier level in San Jose.

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Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

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5. Americans Sofia Kenin and Bethanie Mattek-Sands upset US Open champions Elise Mertens and Aryna Sabalenka, 6-3, 7-6 (5). The pair, making their team debut this week. appears to be perfectly in sync thus far. Kenin also claimed her singles match earlier in the day against Anastasia Pavlyuchenkova, 6-3, 6-2.

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

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Getty Images

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles

Top 5 Photos, October 1: Djokovic's winning return; Osaka all smiles