Note Gilbert Melendez is ineligible for the rankings. Also the rankings an open ballots on the mmaforum.com:

Top 10 MMA Lightweights (4/28/16)

1) Rafael dos Anjos (1) 

Rafael dos Anjos will defend his title against Eddie Alvarez at UFC Fight Night: dos Anjos vs. Alvarez on July 7th on UFC Fight Pass. This will be the first of three UFC events during UFC International Fight Week in Las Vegas.

2) Khabib Nurmagomedov (2)

While nothing is set in stone it can be assumed that Khabib Nurmagomedov will likely get the next title shot. He was certainly able to work out the ring rust against Darrell Horcher on Apr 16th at UFC on Fox: Teixeira vs Evans.

3) Eddie Alvarez (5)

Eddie Alvarez will challenge Rafael dos Anjos for his UFC Lightweight Championship on July 7th to be broadcast on UFC Fight Pass during UFC International Fight Week. The event will be hosted in Las Vegas, Nevada.

4) Tony Ferguson (N/A)

In his first fight of 2016, Tony Ferguson will fight Michael Chiesa at UFC Fight Night: Ferguson vs. Chiesa in the main event on at the Denny Sanford Premier Center in Sioux Falls, South Dakota on Wednesday, July 13th.

5) Will Brooks (8)

Will Brooks signed with the UFC yesterday after being released from Bellator MMA and vacating the Bellator Lightweight Championship. He will now be facing Ross Pearson at The Ultimate Fighter 23 Finale in Las Vegas.

6) Edson Barboza (6)

To continue his upward momentum, Edson Barboza welcomes back Gilbert Melendez at UFC on Fox: Holm vs. Shevchenko at the United Center in Chicago, Illinois on Saturday, July 23rd. Barboza has everything to gain here.

7) Nate Diaz (10)

Nate Diaz will be fighting Conor McGregor at UFC 202 in a rematch on August 20th in Las Vegas, Nevada. Diaz stands to only gain again from this match as he out classed McGregor the first time around and can do so again.

8) Anthony Pettis (7)

On a three fight losing streak, Anthony Pettis will finally be making the drop to featherweight at UFC on Fox: Pettis vs. Oliveira at the Rogers Center in Vancouver, British Columbia, Canada on Saturday, August 27th.

9) Donald Cerrone (3)

Donald Cerrone will be fighting a second time at welterweight against Patrick Cote at UFC Fight Night: MacDonald vs. Thompson on Saturday, June 18th at the TD Place Arena in Ottawa, Canada in a veterans match.

10) Benson Henderson (4)

In his Bellator MMA debut Benson Henderson came up short against Andrey Koreshkov for the Bellator belt.

Honorable Mentions

Justin Gaethje, Michael Chiesa, Michael Chandler