Just a couple bike lengths separated the lead duo over the closing stages and Savatgy made a major challenge on the final lap, diving to Smith's inside with a couple corners remaining, but ultimately it wasn't enough to get by. Smith crossed the line just four-tenths ahead of Savatgy.
"The racing this year has been crazy. The top five riders are so close," said Smith, who became the third 250SX Class rider this season to earn his first career win and follow it up with another victory. "[Tonight] it was about the start and minimizing the mistakes. The track was really tough. My team made some changes to my bike and they worked out great."
Savatgy's fourth straight runner-up finish is the third in a row in which he led laps but came up short of the win. Osborne rounded out the podium in third.
"We rode good and did what we had to do. I executed off the start, put ourselves in a good position [out front], and started to pull away," said Savatgy. "It seems like I want to just give these things away. I can't even begin to explain it. I'm frustrated, obviously. We'll go into the break, regroup, and come out swinging [at the next race]."
Savatgy maintained control of the championship lead with his second-place effort, but Smith closed the deficit to just six points. Osborne is third, 12 points behind Savatgy.
The Eastern Regional Championship will now take its lone break in action for the 2017 season, returning to the track at MetLife Stadium in East Rutherford, New Jersey, on Saturday, April 29.
The 2017 Monster Energy Supercross season continues next Saturday, April 8, for the 14th round of the championship and an anticipated return to Seattle's CenturyLink Field for the first time since 2014.
Main Photo: Tomac's fifth straight win moved him to within just four points of Dungey for the championship lead.
Credit: Feld Entertainment, Inc
Monster Energy Supercross - The Dome at America's Center - St. Louis
450SX Class Results
1. Eli Tomac, Cortez, Colo., Kawasaki
2. Ryan Dungey, Belle Plaine, Minn., KTM
3. Marvin Musquin, Corona, Calif., KTM
4. Jason Anderson, Rio Rancho, N.M., Husqvarna
5. Josh Grant, Wildomar, Calif., Kawasaki
6. Cole Seely, Sherman Oaks, Calif., Honda
7. Blake Baggett, Grand Terrace, Calif., KTM
8. Broc Tickle, Holly, Mich., Suzuki
9. Malcolm Stewart, Haines City, Fla., Suzuki
10. Justin Brayton, Mint Hill, N.C., Honda
450SX Class Championship Standings
1. Ryan Dungey, Belle Plaine, Minn., KTM - 276
2. Eli Tomac, Cortez, Colo., Kawasaki - 272
3. Marvin Musquin, Corona, Calif., KTM - 227
4. Cole Seely, Sherman Oaks, Calif., Honda - 211
5. Jason Anderson, Rio Rancho, N.M., Husqvarna - 188
6. Blake Baggett, Grand Terrace, Calif., KTM - 163
7. Davi Millsaps, Cairo, Ga., KTM - 160
8. Broc Tickle, Holly, Mich., Suzuki - 143
9. Chad Reed, Dade City, Fla., Yamaha - 136
10. Dean Wilson, Clermont, Fla., Husqvarna - 136
Eastern Regional 250SX Class Results
1. Jordon Smith, Belmont, N.C., KTM
2. Joey Savatgy, Thomasville, Ga., Kawasaki
3. Zach Osborne, Abingdon, Va., Husqvarna
4. Dylan Ferrandis, Lake Elsinore, Calif., Yamaha
5. Christian Craig, Corona, Calif., Honda
6. Adam Cianciarulo, Port Orange, Fla., Kawasaki
7. Mitchell Harrison, Brighton, Mich., Yamaha
8. Gannon Audette, Tallahassee, Fla., Kawasaki
9. Kyle Cunningham, Willow Park, Texas, Suzuki
10. Anthony Rodriguez, Cairo, Ga., Yamaha
Eastern Regional 250SX Class Championship Standings
1. Joey Savatgy, Thomasville, Ga., Kawasaki - 146
2. Jordon Smith, Belmont, N.C., KTM - 140
3. Zach Osborne, Abingdon, Va., Husqvarna - 134
4. Adam Cianciarulo, Port Orange, Fla., Kawasaki - 128
5. Dylan Ferrandis, Lake Elsinore, Calif., Yamaha - 104
6. Christian Craig, Corona, Calif., Honda - 81
7. Luke Renzland, Hewitt, N.J., Yamaha - 70
8. Anthony Rodriguez, Cairo, Ga., Yamaha - 69
9. Mitchell Harrison, Brighton, Mich., Yamaha - 66
10. Kyle Cunningham, Willow Park, Texas, Suzuki - 62