PHILADELPHIA — White Sox right-hander Lucas Giolito allowed one run and three hits in seven innings in his last start against the Mets and declared he was back on track.

For the Sox, it was good to have Giolito back. His All-Star first half was one of the highlights of a season that has gone south since the break, and it would mean plenty for the Sox to have Giolito be the guy who wowed baseball after his poor 2018 season.

Giolito, who is 0-3 with a 5.65 ERA in his last four starts, will open the Sox’ four-game series against the Tigers on Monday in Detroit believing he knows where things went off the rails.

‘‘The biggest adjustment was my pace and rhythm and tempo,’’ Giolito said Sunday. ‘‘I got away from that, how I like to control the game. I started missing on a few pitches I usually make. In my last start, I made adjustments, got my rhythm where I wanted it. Just make sure I stay in that lane.’’

It’s not unusual for pitchers to go through dead-arm periods, but Giolito said he has managed to avoid that this season.

‘‘The last few years it’s been early, spring training and April,’’ he said. ‘‘But this year I haven’t really had a true dead-arm phase, where it gets achy and that stuff. This year I’ve been much more healthy when it comes to that. I’ve had a couple of starts where the velocity is a tick down, but I haven’t had that same [dead-arm] sensation I’ve had in years past.’’

Santiago getting a start

Left-hander Hector Santiago will be recalled from Class AAA Charlotte as the 26th man to start the second game of a split doubleheader Tuesday against the Tigers.

Claimed off waivers from the Mets in May, Santiago is 1-4 with a 5.84 ERA in seven starts at Charlotte. He made eight relief appearances for the Mets, who designated him for assignment in June.

Santiago pitched 102 innings for the Sox last season, making seven starts and posting a 6-3 record with a 4.50 ERA. This is Santiago’s third tour of duty with the Sox, who drafted him in 2006.

Rookie right-hander Dylan Cease will start the afternoon game of the doubleheader.

This and that

The Sox are 11-4 when rookie outfielder Eloy Jimenez hits a home run. He connected against right-hander Mike Morin.

‘‘Hanging slider,’’ Jimenez said.

• Second baseman Yolmer Sanchez (2-for-4) notched his 500th career hit.

• Outfielder Jon Jay, who batted fourth for the second consecutive day, has reached base safely in 26 of 29 games and is batting .330.

• The Sox are 6-11 in interleague games.